* Illuminations, Yankee Candle, or just about any candle store
* Disneyland or any Disney Store
* Amazon.com, or any bookstore, or for that matter any video store
* Any grocery store when I haven't had dinner yet
I'm sure there are more. Near the beginning of the month is especially treacherous, as it's payday.
One caveat: This rule is suspended when I'm buying things that I either actually need, or that I'm buying for an organization that's going to pay me back - like tonight, for example, when I went shopping on orientaltrading.com for LYC stuff and luau stuff for G'con parties. So nyeh. :)