Pranks in universities

Over dinner a few days ago, the director of the company I work in, an actuary from London, a colleague and I were talking about pranks in university. While I have never experienced any sort of prank, it is really interesting to listen to their stories. It's similar to what you watch in movies.

1. Serene wrapping the toilet so that it splashes on you when you use the toilet.
2. Tying a drunk friend to a tree, naked, in the winter. This is just crazy, to be honest!
3. Holding someone upside down in a toilet bowl and flushing the toilet. Worse still, the actuary said that some people do this in used toilets. Yuck.
4. This is really good, I'd like to know how to do it in just an hour. This guy comes back from class and notices that none of his belonging are in his room. He walks to another room on another level and everything is there, arranged exactly the way they were in his room. He tells his friend he is going our for a smoke and expects everything to be back in an hour and I think they got it done in an hour. To be honest, I would be really mad if anyone touched even just a book of mine, let alone a whole room. 
5. In this particular university in UK, many years ago, students were given one or two pints of milk a day. One day, this guy's friends offered him orange juice in the bottle and when he drank it, everyone started laughing. What they did was pee in the bottle, add in orange concentrate and add water. Ew! I gave this disgusted look and the director of the company told me, "I'm still alive." Haha. Well, at least urine is sterile. Hahaha.

I sure am glad I didn't experience anything like that.