I've had two. One I cannot remember and my mom wouldn't talk about it - apparently it is bad luck to talk about these things. I was 5 and flying from LHR to KUL and we had to stop in Bombay for a couple of days - from what I can remember the engine was on fire. But I don't remember much of the episode except that on the way to the hotel, there were people sleeping on the streets on both sides of the road all the way to the hotel.

2nd incident was on a ZOOM airlines from YYZ to GLA.. It was a rainy day at YYZ - but when we took off it was just kind of misty or spitting, not really raining. As we were ascending, we hit turbulence and the plane dropped who knows how much - but so much so that my heart was in my throat - the feeling you get when you are on a roller coaster and the thing just made a plunge. And people were actually screaming + crying.. That was scary..
and the worst thing is, the guy next to me was scared of flying and he had just told his wife who was seated in the middle row with her parents that he thinks "today is the day" Needless to say, he drank quite a bit after and fell asleep on my shoulder all the way to GLA. His wife had to keep apologizing to me.. haha..