The idea of baseball for men over 30 has certainly caught on.

But he was before his time and the idea didn't catch on.

If the idea catches on, will poor parents pay their kids $2 per book?

But the idea has been catching on in other areas as well.

The idea caught on and eventually spread around the country.

Maybe a series of them, if the idea catches on.

That was essentially how the line started nearly 100 years ago, but the idea never caught on.

Then students started raising money in the early 1980's, and the idea caught fire.

Now, all at once, the idea caught fire within him.

One never knows, of course, how an idea will catch on.