The Flash could do everything twice as fast. Except you never saw him think twice as fast or speak twice as fast. Could he do math faster than the other superheroes? Could he compute the tip for the bill twice as fast?

Once bitten, twice shy. Once caring, twice cry. Once beloved, can’t deny—heart broken, twice die.

The deaf laugh twice.

Nobody is shamed twice.

Once bitten, twice shy.

Lies are accepted once, not twice.

The lazybones must work twice.

Opportunity seldom knocks twice.

Work is twice done by the man in a hurry.

Wine that isn't paid for is drunk twice.

It is folly to sing twice to a deaf man.

Even the king does not dine twice.

It is the fool's sheep that break loose twice.

You cannot hang a man twice.

A fox is not caught twice in the same snare.

Old men are twice children.

Who buys cheap pays twice.

A work ill done must be twice done.

If the Earth could be made to rotate twice as fast, managers would get twice as much done. If the Earth could be made to rotate twenty times as fast, everyone else would get twice as much done since all the managers would fly off.

Time was the greatest murderer in history.

I don't want to see a movie twice. I don't want to do anything twice.