I ran into one coming back from LA. I have a knee replacement and tripped the metal detector and they didn't have a body scan machine available so the very polite security lady said they would have to have someone do a pat-down search. I told her "No problem" and waited for a guy to pat me down. He swaggered out and said "come with me Sir". I told him my personal stuff was on the conveyer belt and reached for the plastic dish with my car keys, coins, wallet. He screamed at me "Don't touch that!" and everybody turned around to see what I was about to touch. I told him I wasn't going off to be searched without my stuff and he said "Don't touch anything. Point to it and I will pick it up". I said, "OK, that's my wallet, that's my comb, that's my dime, that's my dime ...." He asked me if I was trying to be a smart a$$ and I said I was not. I was just trying to deal with someone who certainly WAS one. You can imagine how it all sort of went down hill from there.
He told me in the future, I should put my wallet in my carry on luggage and let it go through the scanner, (in which case it would be sitting unattended on the conveyer belt when he dragged me off to the "pat down" area). I assured him that would never happen and he hoped I would not pass through his airport again. I told him he could take that to the bank.
First time I've ever experienced any trouble in an airport.