The Toon performs some sort of cartoonish act of violence. This may be handing someone a bomb, hitting someone with a cartoon mallet, burping a burp that is so noxious it melts flesh, or anything else as long as it is cartoonish.
The attack is more of a throwaway gag than a plot element, so any props or properties of the attack are incidental and disappear immediately. Animated mallets evaporate in a puff of smoke, fire does not spread, and electricity cannot power devices.
Spend an Action, Exert your Mind, choose a target within Arm's Reach and roll Wits + Performance, Difficulty 6. The target may use a Reaction to dodge or parry. Damage dealt equals the difference between your attack roll's outcome and the dodge/parry roll's (if one was made), plus 3. The target's armor is Fully Effective.
The chosen flavor of the attack cannot have a mechanical impact. For example, if you choose to eat a spicy pepper and blow fire into the face of an evil snowman, the fact that the attack is flavored as fire will not increase its damage.
When your Attack hits, flip a coin. If you lose, it deals -4 Damage (to a min of 0). If you win the flip, it does +3 Damage.