Good Riddles

Question: What is something of which there are multiple, but you can't make full a list of, while you can make a list of the worst ones.

Question: What does this code mean?: YY U R YY U B I C U R YY 4 ME

Question: Two brothers are twins. One twin says he is older than the other. The other twin is confused and says: in order for us to be twins we have to born on the same day. How is the one twin older than the other?

Question: A man with a stick walks up to another man. Why?

Question: How do you catch a giraffe? Giraffe bait. How do you catch a shark? Shark bait. How do you catch a master?