This is the bizarre moment water left in a car overnight freezes instantly when shaken.

The footage was captured in Chester County, Pennsylvania.

The filmer explained: "The supercooled water left in my car overnight isn’t able to form ice until it is agitated, giving ice crystals something to form on.

"Once they do, the chain reaction of ice crystallization is instantaneous."

The footage was filmed on December 16, 2017, but has recently emerged online.