Computer-based Pranks?

[GrinningManiac]

Just now, my brother left his facebook account online on his laptop whilst he was downstairs

I had free reign, but I didn't know how facebook worked (hate the damn thing), I was pressed for time and I couldn't think of anything witty. So I just left a message on his thoughts page saying "My brother seems to have left his account unattended. What a moronic delinquant! Ha! Look at his pictures, he looks like a woman! A malnourished woman at that!"

He found it and deleted it, but it got me thinking about what I could have done in that time, and what other hilarious pranks can be pulled when you get hold of someone's computer and/or login details for whatever

What pranks have you done/seen/concocted based around the internet and computers in general?

Beyond the obvious "put porn as his screensaver" thing

 

[Darktau]

I made an auto-shutdown command on my brothers that he had to boot in safe mode to rid himself of

 

[reg42]

Change his sexual preference! ho ho ho ho ho! It's so brilliant!... What? It's not? ok...

 

[Deofuta]

Well this depends, are you fluent in the use of keyloggers/botnets/trojans/.bat files? If so, you can have a party!

 

[TheNumber1Zero]

You should of changed his username and logged him out.

Simple enough, but he would of had an annoying time finding it again.

 

[ma55ter_fett]

I belive I heard of a "prank" someone else pulled that was almost identical to yours... I think it involved money though.

 

[dommyuk]

Find a picture of his Operating Systems Shutdown screen, then set it as his desktop wallpaper, then hide all his icons.

 

[Sampler]

Post it note on the underside of an infra-red/laser mouse is always a staple at work.

If you have the time there's screen savers that look like a blue screen of death which can be highly comical.

Over a network you can use the shutdown.exe with sufficient privileges to get it to pop up a warning there machine will shutdown in 30 seconds.

Also a fun one on the network is to create a folder on their desktop entitled "midget porn" or such and then change the permissions so they can't delete it.

I'm popular at work

 

[Davey Woo]

Search for an image of a broken LCD screen on google.
Set it as his background and then remove the taskbar and icons on his desktop.
Leave the screen lying down on the desk for him to come back and cry.

 

[iLikeHippos]

I press some keys that shifts the window so the top goes to the left edge, and the bottom goes to the right. It takes one second to do, if you do it right. Than you can act all innocent.

 

[GrinningManiac]

Post it note on the underside of an infra-red/laser mouse is always a staple at work.

If you have the time there's screen savers that look like a blue screen of death which can be highly comical.

Over a network you can use the shutdown.exe with sufficient privileges to get it to pop up a warning there machine will shutdown in 30 seconds.

Also a fun one on the network is to create a folder on their desktop entitled "midget porn" or such and then change the permissions so they can't delete it.

I'm popular at work

Give this man a medal!

Genius!

All the others are brilliant as well, though I couldn't do all that stuff with keyloggers and whatnot

 

[DazZ.]

For Facebook you could change his birthday, and then a month or so later everyone starts wishing you happy birthday.

Comment on a few pictures about how shiny peoples gums are looking.

Relationship status is fun if they are single or not.

Start friend inviting everyone that they have mutual friends with.

Few basic Facebook ones that are subtle and not going to be obvious right away, like changing their status.