Personally, I'm a fan of long jokes.
A teenage boy named Michael sits in class, when he hears they will be having a new substitute teacher for a few weeks. The substitute turns out to be a young, super-hot blonde. Michael immediately gets a crush, but he's not sure whether he'll ever be brave enough to make a move.
One day, Michael deliberately gets himself in detention, knowing the substitute will be monitoring the detention that day. So there they are, late in the evening, chatting and laughing. Suddenly, a thunderstorm cuts the electricity from the whole school. They light up a few candles and continue talking. The atmosphere is magical.. One thing leads to another, and... well, let's just say that before long, some magic happened.
Michael gets home late with a big smile on his face. His dad angrily asks where he has been. Michael tries to think of a good excuse, but decides it's better to tell the truth, even though it might make his dad furious.
So he says: 'I had sex with my teacher' and closes his eyes, waiting for a lot of yelling and being grounded for several years. Instead, Michael's dad grabs him by the shoulder and says:
'Son, you have become a man! Now, how about we go and get you that mountain bike you have wished for so long first thing tomorrow!'
So, the following day, Michael and his dad step out of the bike shop with a brand new mountain bike, and Michael couldn't be happier.
Michael's dad says: 'Well, now that you have the bike, why don't you ride it home?' Michael replies: 'I would love to give it a try, but my butt is still quite sore.'