Remind me again, why do I work in retail?

Yeah, my job has been straight kickin my ass. We got hammered with a huge book buyback today, so while two of us were working on that, the other line was checking people out, but got a little backed up. Well, this old dude, who was checking out, started being loud and was making a stink, and said something about "the manager...and having to wait," and then said, "yeah, you over there with the glasses..." I about snapped. My first thought was to say, "Shut the f-ck up you old coot!" My 2nd was to climb over the counter and snap his friggin neck ninja style, and then the 3rd, more realistic result, was me saying in a rather stern voice, "Sorry, Sir, but we're doing what we can," and calling additional help to the registers. I then mumbling under my breath, "you f-ckin idiot..." as I hear him continue to ridicule me and the store.

We were a little understaffed because the floor person had to cover Cafe for the afternoon, but with 3 of us up front, and 2 in the backroom, I figured we could handle a normal Thursday. That is, had it not been for the buyback from hell. Anyway, screw the old dude who thinks I owe him something because he's old, and has nothing better to do than wallow in his self pity. It does burn my ass, though.