once hell freezes over

Never; at no time. Sure, Bob, you can be the head of this company—once hell freezes over!

Name	Pronounced	Usage
Florrie	['flɔri]
Oz (2)	-	Hebrew
Ichabod	IK-ə-bahd (English)	Biblical
Tanner	['tænə]
RadomiŁ	rah-DAW-meew	Polish
Karl	KAHRL (German, Danish, English, Finnish)	German, Swedish, Norwegian, Danish, English, Finnish, Ancient Germanic