Whats the easiest pitch to hit bombs?

I thought since the twins pitchers have been so good at giving up bombs I thought this would be an interesting topic to discuss... If anyone has any metrics on this please input (especially if it relates to our Twins pitchers). So, what failed pitch do we see get hit out more than others, is it a flat slider, change left up, low 90s fastball down the middle, sinker with no sink, etc...

For me it was always the hanging curve/slider. Though the harder the pitcher throws the more energy he contributes to the ball coming off the bat.

I would say straight four-seam fastball or a hanging breaking ball.

A pitch thrown by Liriano.....

Hanging slider or a good ole' meatball right down main street.

Four seam fastball with no movement, i.e. a Capper.