Add a prime number with another prime number and you get a prime answer. Add an odd number and another odd number and you get...a prime. Add a prime and an odd number, and you get...an odd!
With the mouth on it's chopped off head. If you get close enough to the head it can still jump slightly and bite you. I've seen a video of it. It will eventually die, but it lives for a couple minutes. I'd say that's useful info in case you chop off the head of a poisonous snake and then think the head is dead and still get bit because you didn't know.