How to hack into ubuntu with a limited account

Where there is a will, there is a way. In our college department computer lab, we're all given those stupid limited accounts - in both Windows and Ubuntu. And that is crap. We can't install compiz fusion in Ubuntu, while in Windows we can't play those ol' games(Mortal Kombat, Roadrash..) during lab hours :( So I decided to take revenge, and went into this research about hacking into the walls)I'll be updating on certain methods you can use to hack.Adios.