I noticed a student writing on his desk. At least he was using a pencil. Unfortunately, he was drawing a gun.
I called him on it. I told him to clean it up.
First, he claimed he didn't do it. Since I witnessed him drawing, that excuse didn't fly. He continued by telling me that he was a designer, and if he cleaned the desk, his design would be gone. I didn't care, said so, and walked away.
Upon my return, I was surprised to find that he had still not cleaned off the graffiti. When I repeated that he needed to clean the desk, he claimed that he had.
The boy's hand was over the spot where the drawing was. I told him to move his hand. He did, keeping the doodle covered. I ended up telling him to move his hand three times before he revealed that the gun was still there.
As this had gone on way too long already, I asked the boy if he really wanted this incident in my note to his teacher. He said that he didn't. He argued a bit more, then finally wiped his markings off the desk.
I did put this in my note. If he had just cleaned the graffiti off the desk when I asked the first time, that would have been the end of it. I shouldn't have to repeatedly ask him to correct something that he shouldn't have done in the first place.