A Belgian walked through the forest when he heard a cry for help. He found a dwarf, stuck in a trap. He freed the dwarf, and the dwarf granted him two wishes.

My first wish the Belgian said, is a bottle of beer that will never be empty.

And flash, there was the bottle. The Belgian opened it, and drank it empty. The next moment, the bottle was full again. The Belgian was very happy.

What is your second wish ?, the dwarf asked.

The Belgian replied: I want another bottle