Brain Teasers

What occurs once in Mike Wazowski, twice in a elephant, but never in a banana?

I'm an assistant at a butcher shop with size 9 shoes. What do I weigh?

What question can you never say yes to?

What invention allows you to walk through walls?

I'm as light as a feather, yet even that strongest person can hold me for more than 3 minutes. What am I?

If you're in a race, and you pass the 2nd place person, what place are you in?

If you're in a race, and you pass the last place person, what place are you in?

The buyer doesn't need it, the creator has no need for it, but when someone uses it, they have no idea that they are.

I'm tall when I'm young, short when I'm old what am I?

Imagine you're in a black room, with no windows, and no way to get out. How do you get out?