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
Gwyneth	-	Welsh, English (Modern)
Zackery	ZAK-ə-ree	English
Pol	-	Catalan
ŽIga	-	Slovene
Oral	-	English (Rare)
RÓRdÁN	-	Irish