Jensen Karp, a writer and comedian, found the suspicious items on Tuesday inside a box of Cinnamon Toast Crunch.
Writing on Twitter, Karp said: “Ummmm @CTCSquares - why are there shrimp tails in my cereal?”
Cinnamon Toast Crunch responded: “We’re sorry to see what you found! We would like to report this to our quality team and replace the box.”
They also asked Karp to message them with further information, and later provided an update once their team had looked into the matter.
“After further investigation with our team that closely examined the image, it appears to be an accumulation of the cinnamon sugar that sometimes can occur when ingredients aren’t thoroughly blended.
“We assure you that there’s no possibility of cross-contamination with shrimp,” the company tweeted.
The reply left Karp feeling “mad”, who also accused the brand of attempting to “gaslight” him.
“Imagine a universe where I’m like, ‘yuck. These are shrimp tails.’ Then I re-examine them a few hours later and realise, ‘nope. These are just accumulations of sugar,’” he wrote.
Karp continued to tweet updates and confirmed that he had already eaten a bowl before spotting the issue.
He revealed that the box also appeared to contain a section of string, dental floss and a round circular object covered in cinnamon.
After commenters suggested that the pea-like item could be rat or mouse droppings, Karp said he had called Poison Control.
“Good news is, if it IS rat poo - I won’t feel the flu-like effects of an infection for a few days,” he announced.
Twitter users began following the saga with interest, with actor Seth Rogen amongst those reacting to the story’s developments:
With Karp yet to state whether he has accepted a refund and that the items are or are not shrimp tails, the drama very much continues…