After doing some additional research, it APPEARS that 2 supply circuits in a single or multiple ganged box is legal (who knew!!). So apparently, I have been wrong for the last 40 or 50 years. Please as noted above check and double check that ALL power is off if you are doing any DIY electrical work.
As for getting shocked: I have personally experienced 34,000 volts hand to hand, threw me 30 feet, fortunately it was a current limited source (about 30 ma). I have also gotten across 125 VDC with a jumper, as noted above copper sprayed all over including my glasses. The jumper vaporized, the 30 amp fuse never blew and I had burn marks on both thumbs, it is a long story. And I have personally seen the results of faults a 4000 to 230,000 volts from work experience, these were all very impressive.
Based on my personal experience, I am very careful around electricity.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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