A whale watching expedition turned into a very one-sided aquatic boxing match when a woman got hit in the head by a whale's tail as it breached the water.

The whale watchers are all congregated on one side of a boat to catch a glimpse of a small group of what appear to be humpback whales, which are known to their curious nature. The whales were very close to the boat and when one of them decided to submerge itself, its tail hit 20-year-old Chelsea Crawford on the head.

Moments before being struck in the head, Crawford, a Canadian currently living in Baja California, Mexico as an English teacher with the LifeDifferent charity, lamented the not being able to have the opportunity to touch a whale before the trip was over, Canada's CBC reported.

"We were about to leave and I said, 'Aww, man, I didn't get to pet one,'" Crawford said, reportedly moments before the whale hit her.

"It wasn't an aggression thing," she said. "The whale was just playing and its tail came up."

So how did it feel? Crawford likened it to getting hit in the head with a basketball. It hurt, but it did not cause her any serious injures.

She told the CBC that the whale's tail was much harder and boner than she imagined it would be.

Crawford's friend happened to record the video and posted it online for friends and family to see.

"We thought it would get 100 views," Crawford said. As of Wednesday afternoon, the now-viral video has nearly 900,000 views on YouTube.