showstopper

n. Informal

1. A performance or performer that evokes so much applause from the audience that the show is temporarily interrupted.
2. A particularly arresting person or thing, especially one that draws attention away from others or brings a course of action to a halt.

showstopping show'stop'ping adj.

(SHO-stop-uhr)

noun
1. A performer or performance that wins enthusiastic or prolonged applause.
2. A spectacularly arresting or appealing person or thing.

Usage
"She grew up to be a showstopper, a hard act to follow in a family of legendary performers. At 28, Janet Jackson is at the very top of her game as one of the world's most dazzling superstars." — Edwards, Audrey, The 1995 Essence Awards: 25 years of celebrating African-American achievement, Essence, 1 May 1995.

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A hardware or (especially) software bug that makes an implementation effectively unusable; one that absolutely has to be fixed before development can go on. Opposite in connotation from its original theatrical use, which refers to something stunningly good.

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showstopper