Humpback whales can grow to be pretty big. How big? Up to 60 feet in length, and they can weigh 40-50 tons. Considering those numbers, it's a miracle the kayakers in the video below are alive to tell the tale of their up-close-and-personal encounter with a humpback.

A group of kayakers with Sanctuary Cruises were enjoying the sight of these huge mammals off the coast of California when suddenly...

Amazingly, the man and woman in the kayak survived the incident, and even managed a smile as other kayakers came to their rescue.