Last night, Jennifer Aniston appeared on Jimmy Kimmel Live to promote her new film, Cake, which is about a woman addicted to pain pills who becomes obsessed with a recently deceased member of her support group. Aniston’s performance is getting a bunch of Oscar buzz and, from the look of the trailer, it’s easy to see why.

While the movie might be on the dark side, her Kimmel appearance was nothing but laughs, partially provided by her participation in a good ole game of “Celebrity Curse Off.” (A previous installment featured Julia Roberts and Sally Field. Too good!)

Facing off against the potty-mouth A-lister was her former Friends co-star Lisa Kudrow, who currently has us in stitches every Sunday night as she reprises her role as Valerie Cherish in HBO’s The Comeback.

The rules are simple: You have five seconds to come up with a bleep-able insult or you lose. Ready. Set. Swear!

It’s hard to talk about the clip without revealing some pretty entertaining spoilers, but that doesn’t mean we won’t try.

For example, we couldn’t ignore how often Aniston incorporated the word “eater” in her profanity vocabulary. We also couldn’t stop ourselves from being impressed Kudrow’s ability to swear in French. How fancy!

Although, to be fair, Aniston also cursed in Greek. We have no idea what she said, but we trust it was filthy.

Watch the clip and let us know if you agree with the effing results. After all, that’s what the comments section is for.