I don't know what to think of the adults asking for candy. Could it be a "family joke" sort of thing?

I really don't get Halloween as a holiday for adults, but some people clearly enjoy the costumes, and that's fine with me. There is a long history of adults enjoying costume parties, so it's not unusual -- just not for me. I've been to a few adult Halloween parties wearing a lame and minimalist costume. Didn't really enjoy them.

I live in an apartment building and there's a signup list at the front desk for those who welcome trick or treaters. Sometimes I sign up; sometimes I don't.