Explain Teenage Boys to me PLEASE!

Ok, so some of you who have been following my posts know of the "roof climbing boys" of mine (and other one other teenage boy, initials JB). Anyway, you'd think they had learned their lesson, but NO! We thought we had made it clear that roof climbing was no longer an acceptable sport in this family. They should have heard, "You don't climb on the roof unless we're home; and if you ever feel the urge to do that again ASK FIRST!". I think instead what they heard was something like this "Roof climbing is fun, do it whenever you'd like! We totally support your roof climbing exploits! We're so proud of you for thinking up such a splendid form of entertainment!"

Why do I say all this, well today the afore mentioned young men, one mine, and one belonging to some other family (R&KB), were on the roof AGAIN. Now I'll give them credit, this time John was home, however they did not get permission; but more importantly, what they failed to process is that John was catching a quick cat nap, and they were bouncing a ball directly over our bedroom!

Suggestions anyone? or just sympathy?