Death by Pile Driver
The scumbags in my domain won't like it one bit, but I believe the honest citizens will. In a fashion first coined by Popeye ( or was it Bugs) a pile driver will clobber them.
I don't think that a direct hit from the top would be the way to go. Too quick that way. Lets say they get pulverized from the feet up. Quick enough so they feel all the whacks, slow enough to let it sink in. They won't even believe its happening - even while its happening!
Online voting of course will come into play, to decide - What fun!