Their whiskers curl up and look all creepy. The funny thing is that they get into candle jars all the time when they're not lit and they get a thick ring of soot around their heads/necks. Damn critters.
When Sigma was a kit he burned off his whiskers and spilled a cinnamon candle all over himself. He had red cinnamon scented fur for a while. That was also the day he ate most of a new bar of face soap and shit foam for a couple days.