Don't get me started. Some clown put his bag in F and walked back to 67F. I yanked his bag out and plopped it in the aisle and asked the flight attendant to check it (after I asked if anyone else in F could claim the said bag in question). Flight attendant called the passenger who huffed and puffed and yelled at me. I said sorry pal you boarded with group 2 with plenty of bin space all the way back.