Good Riddles

Question: You are awoken at 3 A.M. by a knock on your door. Your parents call you to let you know that they are there for breakfast. You are confused but quickly think of what food you have. You have bread, jam, butter, and eggs. What do you open first?

Question: I'm in everybody but everybody still wants me.
I won't feed you but I'll feed the tree.

What am I?

Question: A man wants to buy a used car. He finds a beautiful Buick for $9500, but he buys it without paying a dime.

How did he manage this?

Question: I can be used to build castles,
but I crumble in your hands.
I can help a man see,
and am found all around the lands.

What am I?

Question: Two people are born at the same moment, but they don't have the same birthdays.

How could this be?