My little girl came and disturbed me at work and asked very nicely if we could go to the pond. So I did a quick google and found out how to make a Paper Boat - and they worked. Great fun, until I tried to launch tow together for a race, got too close to the edge and slipped in. Wet and cold. Still everyone else thought it was funny.
Anyway, it is a good site for how to make a paper
boat, and it has a German Joke on the page as well! The main site has lots of German fun and games.
("German Jokes" is the commonest Google keyphrase to find this site - go figure!)