Did you know? You are supposed to get your dryer serviced—and the lint vacuumed out of its innards—every six months. Otherwise the built-up lint can IGNITE OMG FIRE!!
It wasn't actually that dramatic; I was drying a load when we started to smell this awful burning-rubber, electrical smell. So I turned it off and the smell went away.
A few days later, the nice repair man enlightened me as to the usefulness of his lint-vacuuming service.
The dryer works much faster now, too.