Offtopic: Hope you're enjoying your weekend. If not, maybe these will help. :)
Clippy
The ghost of Clippy is back to haunt you! Or someone you know. :P Remember when you trivialized/despised Clippy and his helpful tips? Well Clippy isn't pleased with the way you've been treating him all these years. Revenge is the only thing on Clippy's mind and he will not stop until he claims his next unsuspecting victim. :P
If you're feeling really evil, run Clippy with this command - "clippy 1 random" - without quotes. He'll popup every second to irritate the person behind the chair. :) Note: Clippy is joke software and some antivirus software may flag him as a baddie, but he's pretty harmless. Clippy runs on Windows 95 onwards.
Crayon Physics
The objective of Crayon Physics is to get the red ball to the yellow star. Sounds easy eh? Just wait till you see what's in store for you. ;) I personally spent 30 minutes completing it the first time. Yeah, I went back for a second time, because it's very addictive.
Crayon Physics is 5.6MB large and runs on Windows only. The author's working on a newer version called Crayon Physics Deluxe. It looks way cooler than the old version but its name doesn't sound very free.
Don't let Clippy find you. :)