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Bogeymen are sentinent creatures who are often considered undead though they technically are not, since they haven't actually died. Bogeymen take shapes to scare people, especially kids. Some bogeymen are more comfortable under a bed, behind a door, or in a cellar. One way to get rid of a pestering bogeyman is to put a blanket on his head, because that makes him busy with being uncertain about his own existence (see Feet of Clay). There seem to be many bogeymen among the regulars at Biers, the bar for undead in Ankh-Morpork.

It is likely that the first bogeyman that ever existed was the primitive anthropomorphic personification of fear, the darkness in the caves, the beasts outside the caves, the terrors of the night. Quoting the reference for this notion will produce a severe spoiler for --.