It's funny, I don't ever lose my keys even though I lose my ID cards, bank card and bus pass all the damn time. It always happens the same way: I'm wandering around in my usual oblivious haze, and I eventually notice my cards have fallen out of my pocket at some point and I hadn't noticed. Last time this happened, it was on a bus, and they were never returned. My keys don't have a tendency to fall out of my pockets like this.
If you could change one thing about yourself, what would it be?