What is behind the infamous "Green Door?" 1 / 9
Once Upon A Time in Hollywood featured Jim Lowe's 1956 hit song "The Green Door"... 2 / 9
Which has a lot of mystery around it due to its cryptic lyrics. 3 / 9
Some say it was inspired by a Chicago tavern called Green Door Tavern... 4 / 9
Which was very popular during prohibition. 5 / 9
A common theory says it's about Gateways, London's first lesbian club... 6 / 9
But there's no evidence of a link between the song and the club. 7 / 9
Back in the Prohibition Era, restaurants painted their doors green... 8 / 9
To signal the presence of a speakeasy. That's the most likely explanation. 9 / 9