I’ve told a few people about decorating our house with luminarias on Christmas eve. Most people who were not from the Southwest kind of scratched their heads and couldn’t figure out why someone would put a candle in a paper bag. “Won’t they catch on fire?” was the most common question.
No, they don’t catch on fire. Here is a shot of our house after they were all lit.
Luminarias on Christmas eve 
Pretty huh?