A 21-year-old man was shot in the buttocks outside the downtown House of Blues after a hip-hop show. That shooting happened just before 4 a.m., as more than 1,000 people were leaving the concert venue at 329 N. Dearborn. A show by hip-hop acts Drake and Sly Polaroid began at 11:30 p.m. Friday. The victim was involved in an "altercation" with someone who displayed a handgun, then shot the man and fled, said Chicago Police spokesman John Mirabelli. The victim, who was not identified, was listed in stable condition at Northwestern Memorial Hospital. Detectives are investigating the case, and no one was in custody as of Saturday evening, police said. Mess around and get shoot in the ass. See people dont know how to act. Gonna fu** it up for everyone who can enjoy a hiphop show and not act like a dumb fu**.