Jam Comics.

Here are the rules.

Usually a 6 or 9 panel comic page. Depends on how many participants. Below lists the rules you can have. You can choose one or even combine a few together if your heart so desires. Write the rules on the top of the page. Now. Depending on what rule(s) you have selected you must start off with the first panel. Once completed, you pass it to your friend... and so on.
The end result is usually hilarious.

1. Backward - Start with the last panel. In each previous panel, show what happened before.
2. Pay It Forward - Illustrate the captioned panel, then add a caption to the next panel (last contributor must add caption to first panel.)
3. Carryovers - Every new panel must contain an image of from the previous.
4. Zoom Out (or In) - Add a panel which incorporates the previous panel in miniature.
5. Panorama - The backgrounds on the entire page must make up a continuous landscape while the comic still tells a story.
6. Alphabetical - Add a panel whose elements are arranged in alphabetical order. (TOUGH.)
7. Monosyllables - Write using only one-syllable words.
8. Monotext - Use only one word in every panel.
9. Icons - Word/thought balloons can only contain images or icons, no words.
10. Allusions - Make a comic which alludes to other comics or cultural works.
11. Restricted Pictures - Tell a story showing only one common picture elements.
12. Snowball - Each new panel has one more object/character than the previous one. Can be cumulative or new stuff each time. Can apply to text as well.
13. Melting Snowball - Same as previous, only backwards.
14. Imageless - You can only use words, sound effects, etc. but no representational images.

This is one of the jam comics that my class did.
As seen below. The Icon rule was put into place!