Balsquat
Public Enemies
They couldn't possibly pull it off with a removable helmet because the under helmet design was never made to actually fit under the helmet with all the wiring, that's why you never 'really' see him take it off in one continuous shot. You'd have to be able to take the neck part off too.
However, if they somehow pulled it off well, and could light up the exposed areas, I would sell one of my testies to get it.
I would also sell your testies to get one