A recent video of Dennis Quaid appearing to lash out on set is going viral.

According to TMZ, the actor was on the set of a movie when he appeared to lose his temper. It's not clear who took the video, which TMZ obtained, but you can watch his rant above. Caution: There's a lot of NSFW language!

"What the f---! Keep going!" he yells. "I am acting here and this d---head wanders onto my set. I can't even get a line out until dopey the d--- starts whispering in your ear and you're not even watching anymore. .... Don't f---ing 'Dennis' me! I am doing my job here! I am a pro! This is the most unprofessional set I have ever been on. This is horses---! I've got these f---ing zombies over here that I have to look at. I have a bunch of p------ staring at me and this f---ing baby. This is garbage!"

The internet is unsure whether this is actually Dennis Quaid losing his temper or if he's just playing a prank. (Buzzfeed points out that many think Jimmy Kimmel is behind the video.) Dennis is known for taking on the character of the self-involved actor. Back in 2008, he and Ellen Degeneres pranked a Starbucks in a hilarious hidden-camera prank.

We also aren't certain from which set this was filmed. Dennis' IMDB lists his most recent project as 2015's Truth, which is in post-production.

We're sure the validity of the video will be clarified soon, but until then, we're keeping our fingers crossed that this is just another prank. (And we wouldn't hate if Jimmy Kimmel was the mastermind.)