Has a corpse ever sat up from a lying position?

There are no scientifically documented cases of a corpse sitting up from a lying position after death. However, there are anecdotal reports and urban legends that describe such phenomena, often attributed to post-mortem muscle contractions or gas buildup in the body. These reactions can create the illusion of movement but do not indicate any life or consciousness. In reality, once a person is deceased, their body does not have the capability for voluntary movement.