I haven't had any really bad flying experiences, but one that really wore me down was an 11-hour non-stop flight during which I was seated in the middle seat between a 4-year old girl who wanted my constant attention (she had the window seat), and her mother (on the aisle) who kept her earphones in almost the entire trip, watched the movies, and pretty much ignored us both and let me babysit. The mom never once offered to switch seats so that she could attend to her daughter, and she never told her daughter to hush up and give me any peace. I guess I could have been rude, but the 4-year old didn't know any better, and I didn't really want to get into a "thing" with mom for 11 hours. The flight was full, and I was stuck.
Man, that sucks. I would have started drinking big time and then maybe the mom would have gotten worried about her daughter sitting next to a drunk.
I had a recent trip where a young child kept staring at me from across the aisle. It was one of those things where you could tell someone was looking at you, you know? Bugged the crap out of me. Forunately, it was only a 1.5 hour flight and I tried to sleep most of the way.