Dennis Quaid yells, curses, loses his mind in NSFW on-set freakout

Warning: Extraordinarily NSFW language

Need a few new insults to add to your repertoire? Dennis Quaid fired off curses in a movie set meltdown that has appeared on YouTube. Apparently triggered by someone walking onto the set, a scary-angry Quaid rants for 40 seconds before leaving. He doesn't seem to know he's being filmed.

Some people online think Jimmy Kimmel may be behind Quaid's meltdown, but we're not so sure — between the extra-profane speech and the sneakily filmed video, it's looking awfully real to us.