Check out this list from a fellow Houston blogger; it's a rather unique list.
I cannot compile such a list for myself, mostly because it will be painful and traumatic and much longer.
Food waste should definitely be included in this list. There are so many times I buy food with plans of using ingredients in a specific recipe, only to not make said recipe, and then the food is wasted, and so goes my money. Shabbat leftovers are a big part of that - making so much food and then wasting it if it doesn't reheat well, or loses its luster after Shabbat. I am definitely trying to do better in the food waste area, so hopefully this food waste proportion will go down over time...
Clothing is also an issue for me. I intensely dislike trying on clothes in a store, so I tend to make my purchase with the plan of returning the item if it doesn't work out. Get this - apparently some stores DO have a return policy where they only accept returns within a specific time period! Or, even better: Loehmann's near my house closed, so now for sure I will never be able to return a skirt I purchased there (um, I have a brand new knee-length black skirt, if anyone's interested...)
Then there are various late fees, penalties to pay (hello Massachusetts - why do I need to pay a penalty on tax I didn't know I owe until April 15?), and so on.
But like I said, it's painful to think about. All those donations - I call them donations to make myself feel better - when I really couldn't afford them, but I had 100% control over preventing them.
What would be included on your list of stupid money spent, and what are you going to do differently this year? Add your comment in the comment box.