I own one style of underwear, and one style only. So, when I wandered through the mall today and saw that american eagle boybrief underwear size small were on sale, I was all "yahoo!" Because, while I may only own one pair of non-athletic shorts, one pair of jeans, and a limited assortment of shirts, my ass is covered.
Anyway, the details are extraneous. All that matters is that I took my on-sale underwear up to the counter to pay.
Sales Associate: You know if you buy five pairs, it's only $15.
Me: Oh, the tag says these are $2.95.
Her: Yeah, they are, but if you get two more, it'll only be $15 dollars.
Me: *pause to multiply $2.95 by 5 ($14.75 in case you don't care to similarly pause)*... I'm not sure that would make economical sense. I just want these three.
Her: But they're on sale if you buy five total.
Me: Yeaaah...I'll just take these, thanks.