Worms really don't feel pain?
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take a sharp pointed knife and sever the spine at the base of the head. With spinal chord severed, pain receptors can not transmit to the brain and say ouch.
how u know that? Were u a fish and it happened to you before?
Removing the entire head will kill it as quickly as possible while sparing it from most of the pain. The key is using a heavy knife, e.g. a butcher knife, to take the entire head off; you must ensure that the spinal cord is completely severed, too. Other methods such as just putting it on ice are not as quick and can result in a rather slow death.