Punk’d By Mayer and Dyrdek

A night of partying prompted John Mayer to put on a show, and take friend, MTV’s reality star/skateboarder, Rob Dyrdek to the hospital to have his stomach pumped.

Just Kidding...

The two pals were at Hollywood's hot spot My House doing shots of Tequila when Mayer decided to woo the crowd with a spontaneous show.

By the end of the night Mayer tweeted, “In triage at Cedars with Rob Dyrdek. When the contents of his stomach hit that silicon bag and we all saw it, we just broke into applause."

But it was all apparently a practical joke.

"It was fake, they were just having fun and screwing around for publicity," a source told People.

And the next day, the Rob & Big star tweeted, “A funny night out with John Mayer."

Not so funny guys, maybe you should work on your material.