Here is one that would really drive you nuts. I know a guy who would make a big deal of hacking whenever he SAW a smoker. We were at the mall once and I had seen someone smoking across the food court. The person was behind him. I had noticed this for at least five minutes. It wasn't until the guy turned around to get up that he started hacking and coughing about the cigarette smoke. It really was irritating.
I know, I have occassionally run into people like that.
We were at a carnival last month and a friend of mine hollered down from the other end of the table where we were all grabbing a bit to eat "Hey, Gabz, let me bum a cigarette"........my friend doesn't smoke, so I assumed it was for someone she was talking to and had the pack passed down to her. she pulled one out and asked around for a light. The guy that was sitting next to her jumped up from the bench so fast he nearly toppled the picnic table.
My friend had gotten tired of his whining about people smoking and did it just to get rid of him....LOL
I got one even better. I had one of those fake cigarettes; like the ones that are supposed to help you quit; and some woman about 50 feet away had a coughing, hand waving fit. LOL