One of the Joker’s most defining characteristics is his evil, cackling laugh and Joaquin Phoenix’s version of the laugh may been revealed from the set of Todd Phillips’ Joker origin film.

A new video from Instagram user UncannyComicQuest has made its way online, which appears to showcase a set video from the upcoming Joker solo movie. The footage, which is shot through some sort of fence, appears to show the film’s production, and a high-pitch laugh can be heard throughout other noises.

Granted, there’s no indication that this video is actually from Joker‘s production, but it could mean interesting things if it is real. A memorable laugh has always been a sort of trademark for the Joker, and this potential version of Phoenix’s laugh arguably sounds like an interesting mixture of Cesar Romero and Jack Nicholson’s previous portayals of the character.

And if the alleged creepy laugh is genuinely from the film, Phoenix’s Clown Prince of Crime may be one of the most sinister incarnations of the character to date.

Directed and co-written by Todd Phillips, Joker stars Joaquin Phoenix as the titular character along with Robert De Niro, Marc Maron, Zazie Beetz, Frances Conroy, Brett Cullen and Bill Camp. It is scheduled to be released on October 4.

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