Another way is to hold him up by his ankles (may take two people) make sure you are over some water (for health and safety purposes ensure it is deep enough as not to cause harm) and then very slowly dunk him in the water, head first, just for a couple of seconds, then pull him out. Repeat this as often as you want but make sure you don't tire yourself out.....lol
Careful not to upset any ginger nuts on this board (I was one once, before the grey set in) this task can also be succesfully achieved if you use blonds or brunettes.