Most stores sell snack size bags of snyder's pretzels in halloween shapes. They're really cute, and a great alternative to candy.
If you absolutely have to have to candy, here's a few hints:
1.) Freeze the candy. Take it out of the freezer before you go to bed the night before halloween. This only works if you don't like frozen chocolate!
2.) Buy stuff you don't like. It's been mentioned, but it'll work every time!
3.) Put a healthy alternative NEXT to the candy. When you feel like eating the candy, eat the healthy alternative instead.
4.) If you feel like eating the candy, chew some gum, suck a mint, brush your teeth, or drink water. I've found that I get a LOT of water in if I drink instead of snacking.
5.) Buy your bags of candy, but also, buy 3-4 snack bars in the bulk section. DON'T open the bags, but when you want a piece, have ONE piece from the bulk stash. Count it towards whatever weight loss plan you're doing. (Unless you're doing Atkins, in which case, avoid this hint completely!!!!)
6.) If you feel like snacking, log online, come to the WISH board, and post about it. Call a weight loss buddy. Look for some HUMAN support instead of EDIBLE support.
7.) DON'T participate in halloween. I know it doesn't seem like fun, but sometimes if everything else fails, your well-being comes before the neighborhood kids.
8.) If all else fails, and you DO "fall into" the Halloween candy, DON'T GIVE UP!!!!!! EVERYBODY has bad days. It happens. Don't beat yourself up about it, and don't lay a guilt trip on yourself. Just let it go, and start your program again the next day.