A chicken run after it's head was cut off. I did once when I was a little kid. It ran about 50 feet with blood spurting about 6 or 8 inches out of it's neck! Then it fell over and flapped it's wings with one last giant convulsion.I don't think I was supposed to be around to see it-but I did.
Here's another one for you city folk:
NEVER pick up a dead snake close to it's head. Sometimes it's nerves will cause it to BITE YOU! Not good - especially if it's poisonous!