How stupid are you?

If you're interested in finding out exactly how stupid you are, just take this quiz!

1 If you have 2 gallons of water, and you need 3, what can you do?
2 When you trip and fall in public, what do you say?
3 When you see an old lady crossing the street what do you do/say?
4 How much would you spend on a fancy dinner?
5 What instrument is most gentle?