Hopefully, you know that when you remove the head from a poisonous snake... it can still bite you. Here's a video that proves a decapitated snake head can still bite you.

This guy killed a copperhead snake close to where his children play. He decided to video the aftermath. The snakes body is still squirming, when it's tail gets a little too close to the removed head, and the head bites the snake... Watch.

(WARNING: Fairly graphic video of a decapitated snake.)