1. Because they can.
2. Because they can't. Can't check how many stars there are for themselves, that is. By the way, the "correct" answer based on current observations is "about 70 sextillion" - that's a 7 followed by 22 zeroes.
3. But it does. Why else do people need to buy new glue when the old one's still "half-full"?
4. Because he was hard enough to understand without having to try to lip-read through facial hair.
5. Presumably because the Japanese air force wasn't as short on headgear as it was on planes and pilots.
6. Because I'm clumsy.
7. Lately, I've taken to continue searching for things after I find what I'm looking for, just so this particular problem doesn't happen to me. I've found all sorts of stuff I hadn't been aware I'd lost.
8. I don't have any friends. The voices in my head must have told them all to go away.