The worst waste of time is my exceptionalism. 

This is a two-fold:

The first component is my use of exceptions to excuse poor behavior. Oh, I worked late the other night, well I probably deserver to stay up all night drinking whiskey watching AVGN videos for the 400th time. I'll make an exception. Just this once.

The second part is assuming that I'm exceptional, by which I'm mean, espeically good at what I do or smart. That is irrelevant, though I'll just save myself some mockery and say I'm not either. Rather, imagine that you had an sweet truck and a bunch of dope ass ropes and shit. You agree to help someone move and don't show up till 10pm because your truck is so bitching as if it would compensated for their requested rendevous time of noon. That's what I do.