Light always underestimates the viciousness of Darkness
Always and inevitably everyone underestimates the number of stupid individuals in circulation.
Everybody underestimates the kick to the groin.
For me, it works to my advantage when people think I'm stupid. If somebody who disdains you or wants to control you underestimates you, you can play their game right back.
The way the world underestimates me will be my greatest weapon.
Each underestimates her own power and overestimates the other's