What do you call something that everyone says will happen but never does?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Light Drops

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Chapters
00:00 What Do You Call Something That Everyone Says Will Happen But Never Does?
00:38 Accepted Answer Score 5
01:25 Answer 2 Score 3
01:42 Answer 3 Score 0
01:54 Thank you

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Full question
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Tags
#slang

#avk47