A mournful end

Two friends meet:

– Why are you so sad?

– Well, I started to pee into my bed at night…

– Don’t worry. There’s a solution. Put a tube on the end and lead it out of the window.

That’s what he decided to do.

They meet a week later. His friend is in mourning.

–    What happened?

–    I buried my wife. She climbed out at night to look for the end and fell out…