Ok, apologies for ths slightly macabre topic!
One of my gggg grandmothers - Charlotte Harvey (nee Wareham) - died in 1844 in Canford, Dorset. According to her death certificate, the cause of death was "Inflamation on the chest caused by swallowing a plum stone"

I imagine that, with less advanced medical knowledge the further one goes back in history, the "causes" of death stated on certificates would consequently become increasingly unusual.
I would love to hear what other people have discovered from family death certificates. What is the most bizarre or shocking cause of death you have found in your research?