AP Shaco?
Did Riot even consider the possibility of AP builds when making Shaco? Those ratios are insane.
With a few AP items, your E turns into a Veigar Ult on a 5 second cooldown and also works on AD champs. Throw in a lich bane, and you've just 100-0'd the enemy tank.
To make matters worse, he has a fear. And it does damage. A single box can chunk half an ADC's health if placed right.
Tl;dr: wat