Stupid things you've done on the school's computer

[Arcturus]

Topic title says it all.
What are the stupid things you've done on the school's computer?

For me, I pressed and held Windows button + E for at least 20 minutes and then put the computer in sleep mode.
Windows button + E opens the C:\ folder. keep pressing it and it opens a million of them.

So, what stupid things have you done?

[Ad Bot]

[SteamingImpact]

4chan

[Anybody]

my friend uninstalled windows, accidentally

[MegaScientifical]

I tried to save these folders of photos from the Field Biology trip. She let the students take them, and so there were some... odd shots.

But I didn't get many of them.

[Arcturus]

http://www.youtube.com/watch?v=ZuoAN6vP_ck&feature=related
Im going to abuse this.