Aren't you supposed to take off at the crack of the shot?

He pointed at the crack running down the middle of the slide.

Both stopped at the crack of power in her voice.

"I just want to know why you're here at the crack of dawn."

He had to have some sleep, but at the crack of dawn he'd be on his way.

"What are you doing here at the crack of dawn?"

With closed eyes he listened at the crack, but could hear nothing.

Why are these things always at the crack of dawn?

Getting up at the crack of dawn for an early morning run?

What are you doing out at the crack of day?