Funny Riddles

Question: You bury me when I'm alive,
and dig me up only when I die.

What am I?

Question: Three men rob a store but come out completely changed. Yet they continue robbing other stores.

What kind of store did they first rob?

Question: What kind of tree is carried in your hand?

Question: Walk on the living, they don't even mumble.
But walk on the dead, they mutter and grumble.

What are they?

Question: A pet shop owner had a parrot with a sign on its cage that said "Parrot repeats everything it hears." A young man bought the parrot and for two weeks he spoke to it but it didn't say a word. He tried to return the parrot but the shopkeeper said he never lied.

How can this be?