I'll stay here till hell freezes over if I have to.

He worried that would be when hell froze over where Cameron was concerned.

Mel would continue to asking this question until hell froze over or he understood what she was getting at.

I'm prepared to sit here until hell freezes over to answer every question.

"Remember when you told me the only way we'd get together again was when hell freezes over?"

"When hell freezes over a sentiment that may very well go a long way toward answering the question."

If we really were a religious sect, with no military power, they'd leave us alone till hell froze.

"Hell will freeze over first," I said, frowning at the empty sky.

"Hell will freeze over first, and he knows it."

Now I'm told it can't be put back on until hell freezes over and cows fly.