when someone's dead for a while and their limbs
stiffen (not the penis, though if
the corpse is
laid face down, the flow of blood to the penis can result in an erection.. a treat for necrophiliacs)
when johnny tried to make the
dead man give him a hand job, ted said "
you idiot! the guy won't move! it's rigor mortis!", so then johnny killed ted and had ted
finish the job before rigor mortis set in