Smart Bomb (Nintendo Comics System)
Smart Bombs appear as standard cartoon bombs, but they are red in color; they were created by the Koopa Troop to act as a countermeasure to the titular Stupid Bombs, likely done in the event the Stupid Bombs backfired on them. They release a gas that raises intelligence when detonated, signified by anyone caught in the gas suddenly wearing an Oxford cap.
Shortly after a Snifit reported to King Koopa that several of his Shyguys had set off Stupid Bombs and rendered themselves dunces, the King shows him a cache of Smart Bombs, explaining their purpose and his plan to counteract the Stupid Bombs affecting his soldiers. The curious Snifit grabs a Smart Bomb, which goes off in his hands, and breathes in the fumes; he becomes superintelligent, and sends King Koopa down to Fryguy Kindergarten before trying in vain to re-train the Shyguy soldiers.