We Germans have a very good humor actually we wrote the book aboud it. A whole compendium. Thousands of pages. The most comprehensive work you'll find. It's just not a funny book.
I can picture this very German explanation of what humour is. A technical manual on it and how to be funny, and yet not a single "lol" was had in the reading
The joke is that Germans love bureaucracy and design and don't do humor, as evidenced by some German chocolate my dad got at LAX that described itself as square and practical.