If you're a frequent subway or commuter train rider, this may not be that crazy to you. But it sure is to us!

Watch as this woman goes from zero to crazy in about one second in Edmonton, Alberta.

When the video starts, she's just sitting there like any other passenger, going through stuff in her purse and looking at her phone.

Then, the crazy happens.

She appears to become instantly possessed and takes out her aggression on her fellow subway rider, who was totally caught off guard.

The poor dude was just trying to eat his can of Pringles in peace!