when hell freezes over and the devil learns to (ice) skate

Never; at no time. Bob, our family will relinquish control of this company to you when hell freezes over and the devil learns to ice skate. That clown will be allowed to run this great state of ours when hell freezes over and the devil learns to skate.

See also: and, devil, freeze, hell, learn, over, skate, to

See also:

when hell freezes over
once hell freezes over
relinquish control over (something) (to someone or something)
behind seven locks
till hell freezes over
until hell freezes over
give (something) to (one) on a (silver) platter
give (something) to (one) on a plate
come naturally
give (one's) eyeteeth

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