be the day hell freezes over

To be an impossible or incredibly unlikely point or event in the future. The day that a Democrat like him gets elected in a blue-collar Republican town like this will be the day hell freezes over.

Common Names:

Name	Pronounced	Usage
Sylvester	[sil'vestə]
Mehitabel	mi-HIT-ə-bel (English), mee-HIT-ə-bel (English)	Biblical
Veikko	VAYK-ko	Finnish
Gennadiy	gye-NAH-dee, gee-NAH-dee	Russian
Pavla	-	Czech, Slovene
Sonja	ZAWN-yah (German), SON-yah (Finnish)	German, Dutch, Swedish, Norwegian, Danish, Icelandic, Finnish, Slovene, Serbian, Croatian, Macedonia