Here's a simple one: switch the user's mouse buttons (control panel - mouse properties - buttons). Also press the CTRL + ALT + Down-arrow. If you're lucky and the user has an Intl graphics card, his desktop will also be upside down.
We've tried the above pranks, but no luck yet... Locking his desktop remains something that's not important to him (probably because he always has to laugh with practical jokes). Here's a list of some other jokes we might try in the near future...
Any other suggestions, preferrably not harmful? Please let me know!
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