My child is deathly afraid of smoke detectors. It certainly doesn't help that ours go off all the time. If I so much as open my oven door when it's turned on, the alarm starts screaming.
Last night it went off while he was asleep and it took his daddy sleeping on his floor to make him fall back asleep. This afternoon it went off for about a half hour straight. Let's just say I got a good long cuddle session out of his fears.
And when it was all over, the brownies were burnt.