Bit drastic Kay!
Quickest way to get a ferret off is to put your hand around it's neck, lift your thumb over the back of it's head and on to it's forehead with the tip of your thumb level with it's eyes. Grasp and pull back with your thumb. This puts pressure on the mandibular nerve system, which leaves the ferret with no option but to open it's mouth. The ferret suffers no stress and no damage. Once you have worked out how to do this, it's fast, easy and 100% effective.
John
Thats far better than 1/2 drowning it. Kay, I hope you were joking !!!!!!!!