Thank you, come again...

So today I go to the 7-Eleven near my house to get a Slurpee. Ok, full disclosure: 2 Slurpees, both refills (hey, they're only 99 cents!), one a 40 ounce traditional Slurpee cup similar to the one pictured, the other a hard plastic, 32 ounce hologram "Superman the Movie" cup I got last summer ('06). I've been bringing that one to get refilled for a while now... and I'm a little embarassed to keep bringing it it, but oh well.
So I go fairly often, maybe twice a week to this particular 7-Eleven to get Slurpees. It's close to my house and they have the second best Slurpees in town. I get two and put them both in the freezer to harden and be enjoyed at my leisure. It's a habit I picked up this summer when things got hot. Having no air conditioner can make a man desperate...
I kinda figured I was going too often to this particular 7-Eleven when a few weeks ago the clerk said to me, "I'll see you tomorrow!" as I was leaving the store. Funny. The next time I came in he started singing in what I can only assume is Arabic. Ok that's a little strange. The good thing is that now I don't have to tell him that both are refills, but he sometimes asks me if they're new. Nope. Always refills. (did I mention they're 99 cents!?!)
So today when I walked in, he didn't notice me. I took my time properly filling both cups and made my way to the counter. The clerk gave me the total before ringing them up, and made a comment about the Superman cup. I replied that I had had it a while, to which he replied, "At least two years!" He then started laughing, turned to his co-worker, and proceeded to, I assume, make fun of me. They were both speaking in Arabic, as they pointed and laughed at me and my Superman cup.
But really, the joke is one him. By getting a refill, he's not getting the $1.06 I would have paid for two new ones! Oh yeah, saving money tastes that good...