People are self-centered assholes.

Exhibit #1:  The idiot in the Mercedes who was paralleling me down Olympic Boulevard this morning.  We approached a construction area.  His lane was narrowing.  A non-self-important Mercedes driver would slow down so he would fall behind me, allowing him the room to cross briefly into my lane and avoid the construction zone.  However, this inconsiderate douchenozzle not only tried to force his way into my lane (making me split the difference between me and the lane next to me), he began blowing loudly on his horn because — naturally — it was my fault that I didn’t realize that since he was in a Mercedes, he obviously had right-of-way. 

Exhibit #2:  The idiot who casually disregarded the — not one, but two — “monthly” signs over my entrance to the parking garage and who tied up traffic, backing up a dozen cars and forcing us to wait while he kept punching the button over and over for a ticket that would never come.