1) Smelled smoke in our house and couldn't find it. It was middle fo the summer and nobody would have a fire place or burning leaves..etc. Freaked us out enough that we called and had them come look. As stupid as it felt, they assured us we did the right thing.
2) Ended up behind an extremely drunk driver once on I35 in Des Moines. The guy ended up hitting a guard rail, blowing a tire, continuing on until the I-80 interchange and didn't quite make the curve. When the police finally got there, he was over heard yelling that he shouldn't be arrested because he's a prominent doctor in the area.
3) Ended up having to call them once here in Nebraska because we were burning one old building (with a permit) and sparks took off and landed on another building that I had planned on burning, but there was no way I was going to be able to manage both fires. Since I know everyone on the fire department, they gave me a lot of crap over that one. I owed them a lot of beer.
4) I've done a lot of driving/traveling. I have called a number of times when I would pass a woman alone on the side of the road with car trouble. I don't want to stop and freak them out as a man, but, I also don't want some other random man to stop and take advantage of the situation.