Uncontrollable straining of your back (your head is bent backward to the ground, and your back is twisted in the shape of a "u"), uncontrollable grimacing, and uncontrollable spasms of your muscles.
It is significant if you recently had a puncture wound
to the foot from the ground, or a puncture wound from a rusty nail anywhere on the body. If you are not immunized see a doctor immediately.
Answer assisted by Chinelo Ikpeama, Medical Student