Pretty much in line with the other postings... my brother-in-law once worked in a Wal-Mart which sold guns, he has also watched Pawn Stars, so he constantly considers himself qualified to "educate" me about guns.
His latest was concern about why auction houses don't have to follow the same rules as a Wal-Mart when selling guns. Mind you he has never actually been to an auction where they sold guns, it was just something he "knew" about. I set him straight, although I know from past experience that it's not likely that he actually learned anything.
One from the past... I used to have my collection on display in my basement. A guy came to work on our furnace and saw what I had. He asked me if I had ever killed anybody. I was too stunned to think up a smart-ass reply.
Missed opportunity, you should have told him "every single person who has seen this collection" and then winked...