Here's a fun forum game
Basically you pick two characters, people, vehicles, aliens, plants, snakes, spiders whatever and then people must say who they think would win in a fight between the two. You can have up to five different fights per post.
It goes a little something like this (I'll start):
1. T-800 Terminator Unit equiped with a Gatling Gun vs Standard Predator Hunter with a Spear Gun, Glaive and Claws
2. Predator Drone vs F22 Raptor (Both Heavily Armed)
3. Stg 44 vs M16 (In this case, Combat use, not against each other)
4. Burmese Python vs Red Tail Boa
5. M1A1 Abrams Tank vs German Super Tiger Tank
6. Han Solo vs Buck Rogers
7. Pokemon vs Digimon
8. Brazilian Wandering Spider vs Sydney Funnel Web Spider
And that's all I can think of at this stage.