Burger Wuss by MT Anderson

As part of his larger revenge plan on the jerk who stole his girlfriend, 16-year-old Anthony gets hired at O'Dermott's fast food restaurant (think: McDonalds). Unfortunately, Anthony didn't anticipate how bad his life could be with Turner (the jerk) as his shift manager ... he may not have been thinking clearly when he formed his grand evil plan.

It's a very funny book, and written in an almost stream of consciousness that illustrates Anthony's neurotic thoughts. Yet despite the fact we know what's going through Anthony's head most of the time, the reader still is left in the dark as to the actual revenge plan - you don't know what's going to happen until it happens.