When it comes to April Fool’s day, even, or perhaps especially, the Ubuntu developers have a sense of humor. As a little thank you present to all their users, they’ve pushed out a little April Fools prank of their own. I don’t want to spoil it for you, but you might not think of yourself as such a good casual gamer after this.
Here is how to activate the prank: (Note that this may only work on April 1st, however I cannot be sure.)

#prank.april enable
#am.gullible true
Now save the file in your-home-directory/.aprilf/fool.conf You will have to create the .aprilf folder. Double check this for typos, just in case.
Enjoy! If you wish to stop the prank, just delete the fool.conf file and reboot again. If the trick doesn’t work after rebooting, try rebooting several times and then trying again. If it still doesn’t work, please post the output of “echo slooflirpa|rev&&echo $USER” (without the quotes) in the comments, so that I can help you.
Warning! Please use your judgment about the person, the computer, and the prank before attempting this. Always try whatever you plan to do on your own computer or some other safe computer before doing anything.
As stated above, be careful and use your judgment. I do not recommend using any of these ideas unless you are absolutely sure no harm will be done.
Know of any great tricks? Share them and tell us how these tricks and others have worked for you.