Ronda Rousey, Tom Brady, Game of Thrones and Dr. Phil got in on April Fools

A bunch of celebrities pulled April Fools' Day pranks on Monday. Here are the best.

Ronda Rousey pretended to quit the WWE to pursue jazz.

Tom Brady also faked a retirement announcement. The Super Bowl champ went as far as starting a Twitter account to deliver the joke. His first tweet: "I'm retiring. In my spare time, I'll be tweeting #LFG"

A little while later, he posted his second tweet, asking, "Was this a bad joke?"

Mark Ruffalo faked out fans by offering a "spoiler" for Avengers: Endgame. But those who clicked on the "spoiler" video got a buffering GIF instead.

We hope this is a joke. Dr. Phil shaved off his trademark mustache -- or he hired a great Photoshopper.

Maisie Williams from Game of Thrones and Jimmy Fallon pulled a fast one on The Tonight Show audience.