I wrote things down in marker all over my friend's desk.
What is your reason for messing up your friend's desk like this?
I wanted to get them in trouble.
You should not damage other people's property. It's mean to your friend and could cost the school money.
Don't hassle me with this. It's only a marker.
Regardless of it just being a marker, it could be very difficult to get off. It would be better if you did not mess with your friends things so they did not have to put in the extra time to scrub it off. Hopefully you make a better decision in the future.