An arachnophobic claims he found a 'nest of the world's most toxic spider eggs' on his Morrisons bananas.
Shopper Rafal Murawski said staff just laughed when he pointed out what he thought was the unhatched Brazilian wandering spiders.
The 35-year-old bought the fruit from the branch at the Peel Centre, Bracknell, on Thursday morning, BerkshireLive report.
But after getting home he was shocked to find the 'nest' on the outside of the bunch - and says he fear struck as he grabbed his groceries.
None of the eggs hatched, but the man fears they could be from of the world's deadliest arachnid.
Morrisons, however, say the company does not source bananas from Brazil, where the more venomous spiders are found.
They says they import the fruit from Ecuador, where there are not as many dangerous species.
Mr Murawski said: "It was shocking really. I bought the bananas and saw there was this horrible spider's nest on there.
"I hate spiders, so I was quite worried. I knew the bananas had come from Ecuador, so I did some research and read a few articles. I think it's very likely these are the eggs of a Brazilian wandering spider.
"They can be very venomous so obviously it was a worry for me."
The dad was left surprised by the reaction of store staff when he returned the bananas.
He said the store manager "just laughed when I told her" - and didn't seem to care that he had a fear of spiders.
"She even offered me another bunch from the same batch," he added
"I was very surprised. I've read in other places stores were closed because of discoveries like these, but there didn't seem to be any process here at all."
A Morrisons spokesperson said: "We're sorry that the customer was worried, but we can confirm our bananas are not sourced from Brazil."
They added that the company "works with selected farms in South America to ensure high-quality agricultural practices are maintained".
The spiders get their name because they roam around the jungle floor in South America at night, looking for prey. The Guinness Book of Records says it's the most toxic spider in the world.
However, there are few deaths from its bite as statistics showed just 10out of 7,000 cases were fatal.
The venom can be extremely painful and cause an unwanted erection in men which lasts for four hours.
