Is it normal that i glued my managers face into a magazine 200 times??

My manager at Sainsburys is a complete Freak. I mean, I just hate him. We all do. Ever since i started working there six months ago all i hear everyday is him bossing us around and treating all the staff like rubbish whilst he sits on his fat arse out the back pretending to do "managers" work.
I took three days off recently, i had to, and when i came back he basically tried to fire me saying that i had taken holiday in a 'probation' stage in my career. What bull. It wasn't just this that made me angry, it was everything about him.
So, i took some of the photos of him off the staff wall (we have a 'photo wall' with pictures of people doing stuff for the store, the most recent photos being from our pancake day festivities) and scanned them and printed out 200 photos of his face. Then i got a copy of Heat magazine and cut out almost every single face and replaced them with his face. I used nearly a whole roll of selotape, glue, and i spat on the centrepage too.
I posted the magazine to his house, finding out where he lived was easy. It took three days before something happened, but oh boy, we knew about it! He came into work, he's all like "Who the hell did this, i demand to know" and Every section in the store (deli, cafe, bakery, tills) All knew about the magazine. So far noones owned up cos obviously i'm not gonna tell anyone. He's gone around and actively shown people the magazine i've heard, and it was really hard not to laugh when i overheard him saying to Karen (the deli manager) "My face is on every page!"
It only dawned on me that he would recognise the photos from the staff wall AFTER i'd posted it. I dunno, maybe it wasn't such a great idea. there are alot of workers here though, it'll probably be alright. i just wanted to freak him out.
is this normal?