Dough!
So I was ruminating whether to order a Diet Coke with my pizza delivery. Soda goes great with pizza. Diet Coke is my preferred beverage (disclaimer: water being my preferred liquid refreshment). But if I order the 16oz bottle, than they know that, hey, I'm all by myself. And should I ordered the 64 oz bottle than I end up paying $2.50 for what I ought to be able to get at the store for $1.00. (Let's just ignore the curious pricing schema of soda companies where double the soda is the same price.) Finally, I decide that my pocketbook is ethically opposed to the profit margin that companies reap from soda sales.
Twenty minutes after I place my order I notice the bottom line. Waaait. This pizza is more expensive than I thought it was. Then I notice it. I came out under the minimum order, so they'd penalized me with a delivery fee. The fee? $2. The amount I needed to spend to avoid the fee? $2. Do!
Note to self: next time don't be so eager to punch in my credit card number to get my pizza on the way so that I can stop cleaning the apt (or avoiding cleaning the apt) so I can get on with my movie night such that I don't pay attention to what the pizza folks are charging me. They're trixy and take my money whenever I let them.