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
HipÓLito	ee-PO-lee-to (Spanish)	Spanish, Portuguese
Cyrus	['saiərəs]
Jouni	YO-oo-nee	Finnish
Blossom	['blɔsəm]
Selby	SEL-bee	English (Rare)
Concettina	kon-chet-TEE-nah	Italian