What is the last thing you take off before bed?

When we see 2 but call 10?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

What is both possible and impossible at the same time?

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?

I am sure no one can have two things for dinner. what are they?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

Buy me, smell me or deliver me, I do not change.

Who am I?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.