Finally during a practice, everything just went bad at once.

But how do you know when one or more of them is about to go bad?

After a while they go bad and can't be used any more.

And I know once things start going bad, the first thing you think about is making changes instead of trying to get better.

Things were going pretty bad for us at the time.

"You never know when one of these things is going to go bad."

He said only one of these had gone bad in 10 years.

If things did go bad, he was going to need help.

You could say that he is the light gone bad.

Especially when he can't walk any more and his eyes are going bad.