Funnyman Robin Williams stunned late-night TV viewers on Wednesday by pretending to snort cocaine and masturbate during an appearance on Jimmy Kimmel Live! The actor/comedian made his entrance on the show by picking up Kimmel's pen and pretending to hoover a line of coke from the host's desk up his nose.

A chuckling Kimmel said, "I know they told you to stop doing that."

The World's Greatest Dad star also shocked as he talked about recent surgery to replace a heart valve, joking he had a baboon heart switch - and then pretending he had side effects as he started pretending to masturbate.

Censors had to pixelate his actions for the airing of the show.

Williams actually had a pig's valve fitted and quipped, "It's great because you can find truffles."

The funnyman also joked the surgery has put him off eating meat - because every time he starts to eat a burger, the "heart goes 'You're one of us now.'"

The censors were also button happy as Williams started talking about vaginas, suggesting "Tiny Vagina would be a good stripper's name".

Williams also went on to poke fun at Jermaine Jackson's son Jermajesty's name; and afterward just shrugged and looked at Kimmel, saying, "We're gonna get letters anyway."

(This news article provided by World Entertainment News Network)