We all know that the type chart is a bit weird for the sake of balance. So that's where this game comes in. Post a type, starting with the second type of the previous poster's type and make up a reason why it:
resists or doesn't resist a type OR
is super effective or not super effective against a type OR
Does not effect a type OR
Make up a reason for why it should be super effective against a type
Poster 1: Poison should be super effective against Steel because it corrodes
metal. Poster 2: Steel is super effective against Ice because the metal that makes cars has a long-standing feud with Ice because of hailstorms.
Here's my start: Ghost resists Bug because ghosts are scarier than bugs, so they resent them.