A short preview or advertisement designed to create interest without revealing full details; someone who teases others.
From 'tease' (Old English 'tǣsan' meaning to pull apart fibers) plus agent suffix '-er'. Evolved from textile processing to metaphorical 'pulling apart' of someone's composure, then to marketing preview.
The word 'teaser' perfectly captures how both annoying people and clever marketers work - they give you just enough to grab attention while withholding satisfaction. Movie teasers exploit the same psychological mechanism as playground teasing.
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