Rate That Trope: Crouching Moron, Hidden Badass

https://tvtropes.org/pmwiki/pmwiki.php/Main/CrouchingMoronHiddenBadass

At first glance, they're The Fool. The Ditz. The sort of person you wouldn't trust to screw in a lightbulb without hurting themself, The Troublemaker, or someone who continually makes a fool of themself around others who find them a total embarrassment. And no, it's not the act of just Obfuscating Stupidity they're really like that.

Most of the time.

Then someone pushes the right button at the right time translation: and things suddenly change. The goofy smile disappears. Their eyes start glowing. An aura of energy surrounds them. Little pieces of rock start floating up from the ground. They begin to speak with the Voice of the Legion. And they proceed to demonstrate the fine art of the Curb-Stomp Battle on everyone involved.

Examples:
Kim Possible - Ron Stoppable
Legally Blonde - Elle Woods
Dragon Ball - Master Roshi

Previous tropes:
Fire Forged Friends - 4.55 (9 votes)
Crapsack World - 3.06 (15 votes)