Graphic designer Phil Lyndon, 52, was suffering from a persistent cough and, one day, he needed to spit up what felt like a huge phlegm wad.
Unfortunately, it was something much more unsightly.
When he eventually relieved himself, Lyndon coughed up a 5mm bug; more specifically, a mayfly nymph.
Upon closer inspection - when staring down into the toilet - the "phlegm wad" was moving.
Lyndon, who lives in Ealing, west London, had been prescribed antibiotics to treat his congestion, but the meds did not work.
"It (the bug) had stopped moving by this point and I took a picture of it on my iPad. When I zoomed into the image I could clearly see that it was a bug. I was alarmed that there might have been something alive inside my lungs and knew instantly that it was not something I could ignore."
