Best riddles with simple answers

What can be swallowed, but can also swallow you?

Slayer of regrets, old and new, sought by many, found by few. What am I?

Thousands lay up gold within this house, but no man made it. Spears past counting guard this house, but no man wards it.

What goes through a door but never goes in and never comes out?

There are 5 ships in a port. The Greek ship leaves at six and carries coffee. The ship in the middle has a black chimney. The English ship leaves at nine. The French ship with a blue chimney is to the left of a ship that carries coffee. To the right of the ship carrying cocoa is a ship going to Marseille. The Brazilian ship is heading for Manila. Next to the ship carrying rice is a ship with a green chimney. A ship going to Genoa leaves at five. The Spanish ship leaves at seven and is to the right of the ship going to Marseille. The ship with a red chimney goes to Hamburg. Next to the ship leaving at seven is a ship with a white chimney. The ship on the border carries corn. The ship with a black chimney leaves at eight. The ship carrying corn is anchored next to the ship carrying rice. The ship to Hamburg leaves at six. Which ship goes to Port Said? Which ship carries tea?

What do computer programmers sing in the shower?

I sleep when you are awake, I am awake when you fall asleep. I can fly but no feathers to aid my flight. What am I?

I eat other animals. I have a big mouth. I am green. I live in the water. Who am I?

Poor people have it. Rich people need it. If you eat it you die. What is it?

I have a tail. I can fly. I'm covered in colorful feathers. I can whistle and I can talk. I am a...