"Dead bodies typically do not fart," Dr. Sharma says. "One plausible [exception] would be someone who ate heavy Mexican food and then died. Since the gut motility may be active for a few hours after death, the gas may make its way to the sphincters and escape as a fart."
Dr. Sharma adds that "it would be scary to hear a dead body fart. Spooky."
Are farts flammable?
"Yes, but not all," Dr. Sharma says. "Farts have methane, hydrogen, oxygen, nitrogen, carbon dioxide, and some other inert gases. Methane and hydrogen are highly combustible. Oxygen facilitates the combustion. Based on the proportion of methane and hydrogen in the fart, a fart could be highly combustible."