Who would ever think of stealing from UFC knockout artist Justin Gaethje?!?!?! That's what Justin wants to know.
Gaethje says he's got photo and video evidence showing a man breaking into his garage in Denver on Wednesday and jacking his $4,500 electric hunting bike ... and now he's on a mission to get it back.
"This guy just stole a bike from my garage in Denver/Lakewood, CO," Gaethje said.
Justin posted a pic of the missing bike -- a Rambo R1000XP, which comes with a $4,500 price tag.