Hunting supernatural beings is a dangerous job. This is something of which Sam, Dean, and a few other people in the hunting community are well aware. As a precaution, they have made a habit of using fake names while investigating paranormal activity. While some of the names are random, a good number are drawn from pop culture figures.
The aliases always work, as they back it up with appropriate attire. There have been a few occasions when they encountered someone smart. For example, when Dean claimed he was John Bonham, his lie was quickly detected. Instead of being discouraged, the brothers came up with more outrageous aliases.
Crowley And Cass Go Hunting For Lucifer
Season 12's episode "The Foundry" finds Cass busy looking for Lucifer on Earth. During his hunt, Crowley partners up with him, and the two go knocking on various doors. When talking to Vince Vicente's friend who was thrown from the door, Cass introduces himself as Agent Beyonce from the FBI.
He believes the man could be Lucifer. Crowley shows up and makes a cheeky remark, qupiiing "I guess that makes me Agent Z." Cass then introduces them both as Agent Beyonce and Agent Z.
The Lake Victims
Sam and Dean investigate the death of drowning victims at a lake in the season one episode "Dead In Water." The deaths have been labeled as suicides, but the hunting duo doesn't think so. They soon discover that the spirit causing the deaths is an angry boy with the power to move through the water.
The boy is on a mission for vengeance for crimes the inhabitants of the small town did years ago. While speaking to the sheriff, Sam and Dean introduce themselves as Agent Ford and Agent Hamill from the US Wildlife Service. This a reference to Harrison Ford and Mark Hamill, respectively, who played Han Solo and Luke Skywalker in Star Wars.
The Phone Mystery
In season three's episode "Long Distance Call," Sam and Dean find out that the phone number used by a victim who killed himself is over 100 years old. They also discover that the number has been used in several different houses, so they visit a phone company to do a proper search on the number.
When they are introduced to one of the techies by the manager, they use the fake names: Mr. Campbell and Mr. Raimi. By this, they refer to actor Bruce Campbell, who starred as Ash Williams in the Evil Dead horror movies that were made by director Sam Raimi.
Sam And Dean Take A Look At An Exploding Shop
Sam and Dean get an emergency call from Cass in the season three episode "Stairway To Heaven." The issue? A shop has just exploded, and angels may have been involved.
They make their way to the shop, and, when they arrive, the attendant identifies them as Agent Spears and Agent Aguillera. Apparently, Cass had told him to expect the agents. Credit to Cass for the obvious reference; the names refer to pop singers Britney Spears and Cristina Aguilera.
Avengers To The Rescue?
After capturing Crowley, Sam and Dean let Kevin know that they have him. This happens in the season nine episode"Devil May Care." Kevin wants more demons to be captured, but Dean says it's not possible.
While interviewing more people and gathering more information, Dean uses the name Agent Stark, while Sam goes by the name Agent Banner. The names are drawn from Marvel characters Tony Stark, AKA Iron Man, and Bruce Banner, AKA The Hulk. In a hurry, Kevin comes up with the alias Kevin Solo, which he once again took from the Star Wars character Han Solo.
Hollywood Priests
The Winchester brothers investigate a religious family in the season twelve episode "American Nightmare." Since the family lives off the grid, the brothers suspect something might not be right with them.
They introduce themselves to strangers as Catholic priests named Father Penn and Father DeNiro. The names are taken from actors Sean Penn and Robert DeNiro. Interestingly, actors Penn and DeNiro starred together in the movie We're No Angels where they also pretended to be priests.
A Fear Disease Catches Dean
Season four's "Yellow Fever" is all about a disease that causes people to suddenly freak out before dropping dead. When Sam and Dean go to inspect one of the victims at a morgue, Dean gets infected. Sam and Bobby thus find themselves in a rush against time to prevent his heart from stopping so that he doesn't go to hell.
Before Dean gets infected, he and Sam visit a couple of people, including the sheriff, who they introduce themselves to as Agent Tyler and Perry from the FBI. This could be a reference to the popular Hollywood director Tyler Perry or singer Steven Tyler and guitarist Joe Perry from the Rock band Aerosmith.
Sam's Premonition
Sam dreams about a murder that's about to happen in the season one episode "Nightmare." He convinces Dean to look for the person he saw being murdered in his dream before he actually gets killed. Sadly, they are too late; when they find him, he's already dead. They realize that the man's son killed him because he abused him as a child.
They interview family members while dressed in costumes mostly worn by priests. They also introduce themselves as Father Simmons and Father Frehley. The names are taken from Gene Simmons and Ace Frehley from the band KISS.
Aliases Finally Backfire
As the big brother, Dean decides that Sam needs a break, so he goes hunting by himself in season eight's "Pac-Man Fever." When Charlie brings a case to him, he decides to teach her hunting, but she messes up badly.
At a coroner's officer, Dean claims that he and Charlie are FBI agents Hicks and Ripley. The names are drawn from characters in the James Cameron sci-fi film Aliens. This time, things don't go smoothly; Charlie is nervous, so the coroner asks for the proper paperwork. When they fail to provide it, she refuses to let them in.
A Nod To The 80s
After cheating in a game titled Moondoor, a young accountant named Ed Nelson gets his body ripped apart by a mysterious force in the season eight episode "LARP and the Real Girl." The Winchester brothers are glad to find out that the best player in the game is none other than Charlie.
Later, they go to Ed's apartment to check if there are any traces of paranormal activity. There, they introduce themselves as FBI Agents Rosewood and Taggart. The reference is from the two police officers that befriend Alex Foley (Eddie Murphy) in Beverly Hills Cop.