Logic Riddles

Question: Why is a room full of married people like an empty one?

Question: What did Robin Hood say, when Little John fired at him?

Question: What is it that no one wants to have, but if he has it, he doesn't want to lose it?

Question: What is in the valley of the glass doors. Listen to the words the houses have no roofs or doors, it just has walls. So what's in the valley of the glass doors?

Question: One female dog goes in and there are no other dogs in there so why did dogs come out?