The gun store I worked in was not too far from a high crime region. I had a couple of gang bangers come in looking for a "9". They reeked of pot. They picked the cheapest one out of the counter. I told them to hold on and I will get one out of the back in the box. I stalled back there and then told them we were out. One of them said to give him the one in the display. Nope, we don't sell display guns. They left.
Had a real fast talking New Yorker try and buy a handgun out of state, no permit, no ID. Get out!
Had a few obvious attempted straw purchases with one guy telling the payer what to do.