Also, on the "other people's kids" theme, on my last plane flight I had to endure a kid kicking my back and kneading my seat with his feet continuously for the entire two hour flight. At one point, I turned around and said in a nice, baby-talky voice, "you know, when you kick my seat, it hurts my back." The mom glared at me and said, "He's TWO. I'm TRYING." He continued to kick my back for the rest of the flight, with no intervention from mom.

I would never have been allowed to get by with that behavior as a two year old. Unfortunately, I also had the misfortune of being treated as two year old until I was about 20, but at least I was a well-behaved toddler.