Hit the X to close the window or check out some other sites that are cool and normal:

Barry Martin's Hopalong Orbits Visualizer
Super cool to look at. Use your arrow keys to control the speed and spin.

Mamono Sweeper
Like if Minesweeper was an RPG. There's levels. It's challenging and fun to learn.

Radio Garden
Live radio all over the world. Click and drag to find a station.