If you're squeamish, this one is not for you. NCBI ROFL blog presents the weirdest things ever found during a routine colonoscopy:
The procedure was uncomplicated with no gross mucosal pathology, however, an insect was found in the transverse colon (Fig. 1, to the left), was found in the transverse colon on a routine screening colonoscopy.).
The insect was aspirated and sent to the lab for further identification. The insect had three body segments (head, thorax, and abdomen) with ventrodorsal flattening of the body and a segmented abdomen, three pairs of legs extending from the thorax (with spikes and claw-like terminal appendages), elongated hind legs, and a pair of elongated antennae extending from the head to beyond the hind legs.
These morphologic findings were most consistent with the nymph form of Blattella germanica (German cockroach) of the Blattellidae family, a common household pest. The patient had a cockroach infestation at home and hence it was hypothesized that she may have inadvertently ingested a cockroach with food.
Now, where's that can of RAID again? Link