Marvel's Watcher is known for adhering to a strict oath never to interfere with the goings-on of mortal beings...but he's also known for repeatedly breaking that oath again and again. Knowledgable fans of the comics anticipated the inevitable moment in Marvel's What If...? Disney+ series when Uatu would finally intervene and become a hero himself. While Uatu did indeed break his oath in the series, the comics version of the character broke his oath a whopping 300 times...and counting.
Uatu is perhaps best-known for his appearance in the Galactus Trilogy, a story told over three issues of the early Fantastic Four books. This was the first instance in which the Watcher broke his oath - an oath with which even the all-powerful Galactus is familiar. When the Watcher vows to stand by the humans in their hour of need, Galactus challenges "Then you would violate your pledge never to interfere in cosmic affairs?" Later on, the Watcher honors his pledge to violate his pledge by sending the Human Torch through the vast reaches of space to retrieve the 'Ultimate Nullifier' - the only weapon in the universe that Galactus truly fears.
But that was hardly the last time the Watcher would break his oath. As part of the 2008 Eternals series, Eternals #7, written by Charles & Daniel Knauf with art by Eric Nguyen and colors by Andy Troy, featured a character named Tiamut, the Dreaming Celestial. When the Dreaming Celestial observed Uatu and scanned him, he discovered that the Watcher had intervened in mortal affairs "...on three-hundred and thirty-seven separate occasions." The Dreaming Celestial subsequently believed the Watcher to be defective.
The Watcher has certainly made a habit of interfering over the years. In Secret Wars II, the Watcher interfered to help the Molecule Man overcome his anxiety and neurosis to use his tremendous (but seldom-used) powers to defeat the Beyonder. He would interfere again during the trial of Reed Richards; the Watcher has often interfered in stories involving the Fantastic Four and thus perhaps knows Reed more than any other human on Earth. He has interfered to defeat another Watcher, revive a woman saved by Spider-Man, and he's most recently interfered in the 2021 series Dark Ages, in which he warned the Fantastic Four (once again) that the Earth was in immediate danger due to the awakening of the living machine Unmaker.
The Watcher is well-known in the Marvel universe - not just because of his oath, but his penchant for breaking it. Thanks to the Dreaming Celestial, readers now know that the events of Marvel's What If...? only scratched the surface when it comes to Watcher interference in the universe. To some fans who have followed the Watcher for over five decades now, even 300 instances of breaking an oath seem a woeful underestimation.