How to make your screen go negative!

Its a windows trick, works with xp and vista, you can make the screen go negative colours, its quite fun to do

All you have to do is press shift, alt and print screen at the same time then click yes to the little message that pops up.

Try it out, its fun

AHH How do I change it back?

just do shift alt print screen again

Lol my computer started beeping at me.