Supply is relative to demand.

A fish leaped out of the water.

I'm allergic to fish.

You can't enter the building without a permit.

Milk does not agree with me.

The milk was diluted with water.

The job advertisement specifically requested females.

I suddenly stood up and felt faint and light-headed.

Suddenly, the basement I was in started to look almost nice and warm.

We've really got to step on it.