I bumped into a little package today called xpenguins. It generates a bunch of cartoons that could be anything from penguins to Bill Gates. Install it with
sudo apt-get install xpenguins
Then run this to generate 256 Bill Gates that will crawl across your screen with little computers.
xpenguins -t Bill -n 256 -s
Click on them or drag a window over them to kill them, and notice the blood. To make it go away, close the terminal window. To make less Bill Gates, change 256 to another number.