My friend is such a jerk. I tossed his car keys over his head into the lake
I bet that really burned his biscuits. Why would you throw your friends keys into the lake?
I've told him to not open the window and he did it anyway!
So now you're stuck out at the lake because you threw his keys into it? You shouldn't take things that don't belong to you without permission and you definitely shouldn't throw other people's things into a body of water. Now you're stuck out there until you two can find the keys and he's going to be extremely upset at you.
What do I get for all the trouble I caused.
Hopefully you can help him figure out a way to start the car. Chances of getting the keys out of the lake are pretty much zero, so you may need to pay for new keys. Next time you get angry at someone stop and take a breath before acting vengeful like this.