Funny Riddles

Question: Who is reading this question now?

Question: What is the easiest way to poke a balloon without popping it?

Question: what did the postman say to the mailbox?

Question: Draw, fire, or fill me;
I'm still empty.

What am I?

Question: Two men went into a restaurant. They sat at a table and the waiter came by and asked, "What do you want to drink?"

The first man said, "I'll have H₂0."

The second man said, "I'll have H₂0 too."

The second man died.

Why?