Quoted from EJS:I would at least do the front legs if you have little ones running around. They might grab onto the legs to support themselves.
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The worst pinball related shock I ever got was at a friend's house.
He had a Williams EM next to a DMD game. There was an AC leak on the EM, and I had one hand on the lockdown bar. I reached down to get my beer on the floor, and touched the grounded leg of the other game.
Wham! Pretty bad shock.
If the leg wasn't grounded, I wouldn't have gotten blasted, but I also wouldn't have known that the EM game had a hot wire in contact with (likely) the coin door.
A GFCI outlet would have tripped, and cut the power to the game plugged into it.