If you've got a fear of spiders, you're not going to like this. On November 2, a Saskatoon man was confronted by a very unexpected visitor in his home. While unpacking groceries from Costo, he came across a black widow spider among his purchases. The man immediately knew the Saskatoon Costco black widow wasn’t a normal spider that you’d find in the area.

According to CTV News, Calvin Bruneau discovered the spider inside a cardboard box he was using to bring groceries home from the Costco on Marquis Drive in Saskatoon.

Bruneau told CTV News that once he spotted the spider, he told his son to keep an eye on it while he found something to capture it with. Once he noticed the signature red spot on the spider’s belly, he knew he was dealing with a black widow.

As these spiders are extremely uncommon in western Canada, it’s a very unexpected thing to come across in one’s home. That said, CTV News also explains that the box Bruneau used to bring his groceries home from Costco was from Grape Man Farms, a California-based company.

It's impossible to know when or how the spider got in the box. Regardless, the impact a black widow can have on a human is extremely serious.

According to the Nature Conservancy of Canada, black widow bites can cause a great deal of pain at the site, painful muscle contractions, and sometimes much more serious impacts.

Though the bites aren’t commonly life-threatening, they advise immediately seeking medical attention following a black widow bite, “particularly for children and the elderly.”

The Nature Conservancy Canada outlines that in Canada, there are two species of black widow spiders. The first is the western black widow, found in B.C. and Manitoba, and the second is the northern black widow, which can be found in Ontario.

They also mention that “on occasion, black widow spiders occur outside of their ranges by hitching a ride on produce such as grapes.”

Luckily, no one was hurt in this instance, but it's certainly given us some extra incentive to check every inch of every cardboard box we come in contact with for the rest of time.

Narcity has reached out to Costco for comment and we will update this story when we receive a response. Stay safe out there, folks.