You’re not allowed to buy things for yourself between Thanksgiving and Christmas. I’m amazed at the number of people I’ve encountered recently who aren’t aware of this rule.
To clarify, this isn’t some overly-restrictive law that says you can’t purchase anything that you’re going to use. You can still buy gas and go to the grocery store for yourself. If it’s something you regularly consume, you’re allowed to continue getting it. It’s those special things, those one-time purchases, those things that could conceivably be bought by someone else as a gift for you that you are forbidden from buying for yourself during this period. If you find yourself thinking about getting something like this between Black Friday and Christmas Eve, stop yourself and instead casually mention within earshot of a spouse/significant other/relative/close friend/other person who might be trying figure out what they could possibly get you for Christmas what it is that you’re thinking about getting yourself, but do not buy it. This may require a bit of patience and some restraint, so resolve to be strong. Under no circumstances should you buy this thing until after whatever gift-exchanging rituals you observe are concluded.
On behalf of tormented would-be gift-buyers everywhere, thank you for following the rules.