My favourite catholic relic is Jesus' foreskin. It didn’t just exist once, not twice, but 18 times! Some day a Vatican librarian realized "wait a second, humans don’t have 18 foreskins" and claimed that none of the 18 foreskins are from Jesus' magnum dong, but instead the real one rose to the sky and turned into the rings of Saturn.
here you go, the claim for the amount is under Traffic in Relics, the claim about the rings of Saturn is under Literary allusions