"Professional Griefers" is a song by Canadian electronic music producer Deadmau5 featuring vocals by American singer Gerard Way.

The instrumental made its live debut during deadmau5's Meowingtons Hax tour mixed with Daft Punk's 2001 song "Harder, Better, Faster, Stronger",[3] premiering the track at his critically acclaimed headlining performance at Lollapalooza.

The vocal version of "Professional Griefers", with Gerard Way, starts with hard beats and heavily distorted guitar stabs, then builds tension with discordant synth strikes leading into the chorus.

The video, featuring both Deadmau5 and Gerard Way, was directed by Paul Boyd and Jeff Ranasinghe and produced by Dave Stewart's Weapons of Mass Entertainment production company.

[10] The video begins near a trailer home whose residents are watching Zimmerman and Gerard battle with giant robotic mice at a UFC match inside a dome (a reference to the Thunderdome from the Mad Max franchise), with a crowd watching (consisting of the aforementioned 2000 fans).