If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Ren has loaded Stimpy into the kitten cannon. Now, see how far you can make him fly!
This game is based on the popular TV show starring Ren Höek, a scrawny chihuahua. When irritated, he calls his friend Stimpy an "eeediot" and slaps him across the face. In this case he launches him out of a cannon.