Why do people do that?

Today, I bring you a list of those things that confuse me. Ok some frustrate me more than confuse, but I thought I'd include them here too. Answers on a postcard, please! (What's the 21st century phrase for that? DM me the buzz?)

1. Why does my dentist ask me questions when she has a tongue clamp and a mirror in my mouth?

2. Why do people run up escalators when there is a perfectly good and often empty staircase right next to the escalator?

3. Why is a 'wise man' someone to be admired but a 'wise guy' isn't someone you'd want around?

4. Why do people say 'Needless to say' and then say it anyway?

5. Why do they make the contestants on Masterchef open the door to the judges' dining room themselves while they're carrying plates of food? Can't someone else help?

6. Why do people come on to an empty train or bus apart from one occupied seat, and choose to sit right behind that person? (It's herd instinct, I know, but it's still annoying.)

7. Why do people say 'I could care less' and not understand they're saying the very opposite of what they're trying to say? If there is possibility (I could) for you to care less, then it means that right now you do in fact actually care. The proper usage is 'I couldn't care less' - that is you care so little, there is no way for you care less.

8. Why do companies call me, and then ask me to prove who I am? Um you called me. Also, why do they make me prove who I am when I'm trying to pay a bill? If they have lots of people trying to give them money to pay my bill, I say let'em, I have no problem with that.

9. Why do people stand and wait for a bus and moan how long it takes, but only when it arrives then suddenly decide to start looking for change/their bus pass?

10. Why do you feel a weird compulsion to do the opposite of what someone says? 'Don't touch, it's hot.' 'Sh, it's a library'. 'Don't look now.'

11. Why do we say, 'You can't have your cake and eat it too'?  Why on earth would I want a cake that I can't eat? There would no point in that at all! (Again, I know what it actually means, but it sounds odd.)

12. The Kardashians.