You walk into a room with a rabbit holding a carrot

Question: You walk into a room with a rabbit holding a carrot, a pig eating slop, and a chimp holding a banana.Which animal in the room is the smartest?

Question: What do you call a sad bird?

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Question: What can be broken but never forgotten?

Question: Where do all the letters sleep?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?