This interview with "author, photographer, and ossuary expert" Paul Koudounaris is a trove of weird stories about the things people get up to with their local mummies, haunted skulls, and other "miracle-performing" remains:
They’re not all like that. One of the more outlandish stories is about a guy who got to be called “pene grande,” which means “big dick.” He was a mummy famed in life for having a big penis. People would go down to the Palermo Catacombs and treat him as the patron saint of big cocks. Finally a newlywed woman came to see him because she was married to a guy who was not well-endowed. She took a cloth and rubbed it on the mummy’s dick, and then rubbed it on her husband’s dick. The next time she had sex with her husband, his penis seemed larger and fuller and she was about to orgasm except that at that moment she looked up and saw it was actually the ghost on top of her. Everyone thought she was crazy, but then it happened again the next time she had sex. They had to set up an exorcism for this ghost.
...They had a blacksmith make a tight-fitting sheath made of metal, and once the husband got erect the ghost came out and got caught in the codpiece. They threw holy water at him.
...That expelled the ghost from the guy’s body. So forever he had a small penis, but he was free of the ghost. As for the ghost, he gained a great following among older ladies, and eventually so many were coming to see him that they had to lock the mummy in a back room, which is where he remains to this day.
...There is an old and very weird story about a ghost of a guy who had lived in the monastery there — apparently the "devil got into him" and he masturbated and had a heart attack at the moment of ejaculation. That's why, they claim, he has that look on his face. Anyway, people said his ghost would visit boys who masturbated and scare them into stopping. One boy didn't really believe this, though, and dared the ghost to appear while he was masturbating. When the ghost showed up, he apparently grabbed the boy by the cock and squeezed him so hard that the boy passed out, and while he wasn't exactly castrated, he was rendered sterile for life.
...There’s a really bizarre story from the 20th century, about a guy who had severe diarrhea and chronic flatulence. He stole a skull and started saying prayers to St. Roch and St. Sebastian, the patron saints of plague and suffering, and also shitting on the skull daily. He had a theory that by crapping on the skull he could switch intestines with the body the skull had been attached to. The ghost kept warning him, quit shitting on my skull. But he kept at it and he succeeded in transferring his intestinal problems to the ghost. The problem was that the ghost had died of testicular cancer, and in return he gave that to the guy. That’s how he died. One of the dangers of necromancy is you don’t really know who’s on the other side or what they’re going to give you in return.