Over the years, Friends has had plenty of prominent guest stars, and Paul Rudd is one of the best-known and most beloved of them, playing the boyfriend of Phoebe for a number of episodes.

However, in a surprising revelation, Rudd has recently admitted that when he first met the cast of the hit sitcom, he actually made a pretty bad first impression on Jennifer Aniston.

Watch Paul Rudd shut down a NSFW Avengers fan theory in the video below:

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In an interview on The Graham Norton Show, Rudd told host Graham Norton all about an embarrassing faux pas that he worried almost cost him the role.

Rudd stated: "I was on the set for my first episode and Jennifer was on a Segway because she had broken her toe, and everyone was marvelling at it. Matt LeBlanc asked to have a go and immediately knew how to do it. I then asked to try it too. I spun round and rolled it right over Jennifer’s foot."

He continued: "The producers’ look of panic was if to say, “Is it too late to fire him? Has his character been established yet?” I felt awful. Such an inauspicious start."

Rudd added: "It was an incredible thing to be part of and the whole experience but seems a bit surreal and a bit of a blur in my memory ... The show was a phenomenon and I was in the very last episode, which made no sense to me whatsoever."

Watch Jennifer Aniston talk about Rachel Green's future:

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"I was on the sound stage and Jennifer Aniston was crying and I thought, 'I’m not supposed to be here,' so to break the ice I went over and said: 'Well, we did it, what a ride.' The joke inevitably fell flat!"

Man, that's gotta be one of the most embarrassing first days at work I've ever heard of.

Paul Rudd feared he'd been fired from 'Friends' after worst first encounter with Jennifer Aniston