showstopper

English Thesaurus

1. something that is strikingly attractive or has great popular appeal (noun.attribute)

hypernym	:	attraction, attractiveness,
definition	:	the quality of arousing interest; being attractive or something that attracts (noun.attribute)

2. an act so striking or impressive that the show must be delayed until the audience quiets down (noun.communication)

hypernym	:	act, bit, number, routine, turn,
definition	:	a short theatrical performance that is part of a longer program (noun.communication)