David Schwimmer, Matt LeBlanc standing in a room: gettyimages-2575795

Remember last month when everyone was jazzed about the Friends reunion? Saaaame—everything was right in the world because the gang was back together to bring us laughs, memories, and tears if I ‘m being honest. But as it turns out, a mysterious guest actor wasn’t so pleasant to work with on set back in the day, according to Jennifer Aniston.

During an appearance on The Howard Stern Show, along with Friends co-stars Courteney Cox and Lisa Kudrow, Jen spilled the tea about a guest actor who didn’t seem too interested in being on set in the first place.

“The funny thing is, that male did apologize about their behavior years later, and just said, ‘I was so nervous, to be honest, that I wasn’t on my best behavior,’” Jennifer said, per People. “It was as if they were just too ‘above’ this, to be on a sitcom.”

“I remember when we were doing a network run-through, the network and the producers would just laugh. And this person would be like, ‘Listen to them, just laughing at their own jokes. So stupid, not even funny,’” Jennifer continued.

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