Old wearer said;

"Yes, plus when you are running or jogging. Real hair will bounce up and down and will (mostly) fall back into place."

So yes, the OP did ask about hair bouncing while running down the street. Read the thread.

The fact is the bounce of natural growing hair would be hard pressed to differentiate from the bounce by a hairpiece by anyone except maybe someone with obsessive compulsive disorder. And even then, it would all be a figment of their paranoiad imagination.