teaser

noun

• 1 informal a tricky question or task: the teams get the chance to pose the opposition some teasers

• 2a person who makes fun of or provokes others in a playful or unkind way.
• a person who tempts someone sexually with no intention of satisfying the desire aroused.
• an inferior stallion or ram used to excite mares or ewes before they are served by the stud animal.

• 3a short introductory advertisement for a product that stimulates interest by remaining cryptic: promotional teasers in every commercial break

• 4 Fishing a lure or bait trailed behind a boat to attract fish: the fish followed the teaser to within thirty feet of the boat