A man in the United Kingdom went to a grocery store and purchased bananas, which unbeknownst to him had a cocoon of deadly Brazilian spiders attached to them and ready to hatch.

Maria Layton shared her creepy discovery with Yahoo News, saying that she went to give her daughter one of the bananas her husband purchased, but spotted something unusual on one of them. When she inspected another one she noticed the large cocoon beginning to come undone.

“The spider cocoon started to unfurl so I put it in a sealed box and put it in the freezer as I read that that is supposed to kill them,” she said.

The spiders turned out to be the very aggressive and venomous Brazilian Wandering Spiders. When not wandering the floor of a jungle at night, these arachnids hide in banana plants.

One bite from these eight-legged insects can cause serious injury, death and for men painful four-hour erections. Their venom is even being studied as a potential treatment for erectile dysfunction.

Layton immediately called Tesco where her husband bought the fruit from and a customer service representative told her that the standard policy is just to bring the bag back to the store.

As the Daily Mail noted, this is not the first time dangerous spiders have been found lurking in people bananas in the U.K. Last October, a family in Waitrose found the same type of spiders on their fruit.