The things kids say. I can't remember who told me this, but it's a good one:
"My friend was on an elevator with a half-dozen other people, including her 4-year-old daughter. It was back in the days of pagers, and a large woman [I recall from being 4 that larger people looked HUGE to me because I was so little] had a pager on her belt. It went off, and my friend's little girl said, 'Mommy, she's going to back up!'"