Global shipping services, like FedEx, deliver millions of packages each day, so it’s understandable that some things can get mixed up in the process. James Potten of Bristol, England recently received what he thought was a Kindle e-reader. Instead, a “specimen return kit” with a tumor inside was delivered to his door.

Described by the BBC as a “courier mix-up,” the FedEx sleeve that the tumor was delivered in was addressed to Mr. Potten but it was intended for the Royal Free Hospital in London, approximately 2.5 hours away.

“My name was on the outside, but the contents weren't what I expected,” Potten told BBC. “I haven't opened the sealed box, which says exempt patient tissue, as it doesn't belong to me. The tracking code on the item had the same first five and last three numbers as my order but it wasn't my Kindle.”

The confused addressee took to Twitter to share his “#FedExFail” with the rest of the world:

Potten later tweeted that the tumor was recollected by FedEx for delivery to the hospital, and he did eventually receive his Kindle. The delivery company said that it will “consider future changes to our processes” so that instances like this won’t happen again.

[h/t: Mashable]