Friends may have ended its 10-season run in 2004, but an eagle-eyed fan on TikTok only now caught an editing mistake you'll have to see to believe. 

TikTok user @bronniiieee shared a video clip from the Friends episode "The One in Massapequa," in which Ross (David Schwimmer) and Rachel (Jennifer Aniston) pretend to be a married couple at an anniversary party for Ross' parents, played by Elliott Gould and Christina Pickles. In the scene @bronniieee shared, Ross and Rachel are speaking to Ross' dad, when suddenly the scene cuts and someone else is standing in Gould's place.