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combined 12"? overhanging/swinging yoke and u-joint at say 100 mph just under your seat. The rotating twisted mess will rip those arms off in less then a second (6000 rpms, thats 100rpms/hits).
Don't most u-joints are going to break at the initial hit, not at speed? I guess you could damage it and have it hold on for a while.
That would be the case if one assumes that the u joint is the weakest link, and i don't believe that's the case enough to discount all other possible driveshaft failures 
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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