A really bad joke (we hope) on Twitter has landed a Los Angeles man in jail. Police arrested 20-year-old Dakkari McAnuff on suspicion of making criminal threats after he allegedly promised to shoot a random stranger in exchange for 100 retweets. Police say McAnuff posted multiple photos on Twitter showing a rifle pointed out a window toward the street, along with the caption, "100 RTs and I'll shoot someone walking," reports KTLA. (His Twitter account is down, but LAist has a cached version of one such tweet via local news.) Police tracked the account to McAnuff and arrested him at his home. The gun turned out to be an air rifle, reports the Los Angeles Times.