I'd either get a Life Shroom to revive myself and freak people out after I die, or a regular mushroom to turn really tall and smash brick walls with my head. Plus, I'd be on a, like, totally rad and gnarly and groovy acid trip.
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"How are you gentlemen !! All your base are belong to us !! You are on the way to destruction. You have no chance to survive make your time. HA HA HA HA ...."
-Cats, Zero Wing (Genesis)