My favorite airport security experience was in Japan. They were doing the whole "do you have any [thing you can't fly with] in your bag?" thing and the guy asked, with a heavy japanese accent, if I was carrying any explosives.

After a few "carrying a what??"s from me, he pulled out a three hole binder and flipped to a sheet with a picture of a cartoon bomb. We both lost it when I pulled back and said "what the hell?? Nooo!"

I didn't have anything special like precheck but he let me get in the rich person line afterward. I guess I just didn't expect to be asked so directly and casually if I was planning an act of terrorism lol