Frustration
When you're running late, it seems as though everything conspires to work against you. Traffic lights turn red just as you squeak up to the front of the queue; innocuous-looking motorcyclists weave lazily in front of your car, in such a way as to obscure your path and make it impossible for you to overtake; pedestrians choose the opening between your car and the one in front of you to cross the road, and they will in all probability have an elderly and largely immobile citizen in their midst; you run into a road hogger, cut into the next lane and end up behind another road hogger...
And on the way home, already late for a dinner function at 7.30, you get on the wrong bus (which was incidentally 20 minutes late), get caught in a massive traffic jam, and run out of small change to buy an LRT ticket.
Entirely hypothetical situation, of course. I mean, it didn't happen to me or anything. No sirree.