Upon receiving the sentence, the prisoner is given a pair of Lego shoes built around his feet. Each brick glued together so that they never come apart. Every morning they will be told to run laps around a track in the Lego shoes. And every evening, jumping jacks. So that they will forever be sentenced to stepping on Legos for the rest of their life.
You commit the crime? You better pray to legojesus you aren't doing the time...otherwise it's Lego shoes till you die...
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That wouldn't do a thing. Stepping on a single lego is terrible, but shoes built out of legos? The surface tension would spread apart, making the pain virtually painless. That's why you have people who can lay down on needle beds all the time, because the "pain" is spread throughout.