A teaser ...

tease
(Merriam-Webster dictonary online)

Pronunciation:
\ˈtēz\
Function: transitive verb
Inflected Form(s): teased; teas·ing
Etymology: Middle English tesen, from Old English tǣsan; akin to Old High German zeisan to tease
Date: before 12th century

1 a: to disentangle and lay parallel by combing or carding b: teasel
2: to tear in pieces; especially : to shred (a tissue or specimen) for microscopic examination
3 a: to disturb or annoy by persistent irritating or provoking especially in a petty or mischievous way b: to annoy with petty persistent requests : pester; also : to obtain by repeated coaxing c: to persuade to acquiesce especially by persistent small efforts : coax d: to manipulate or influence as if by teasing e: to make fun of : kid
4: to comb (hair) by taking hold of a strand and pushing the short hairs toward the scalp with the comb
5: to tantalize especially by arousing desire or curiosity often without intending to satisfy it

synonyms see worry
— teas·ing·ly \ˈtē-ziŋ-lē\ adverb

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