Chevrolet 2008 Corvette Owner's Manual page 33

CAUTION:
{
Never do this.
Never allow a child to wear the safety belt with
the shoulder belt behind their back. A child can
be seriously injured by not wearing the
lap-shoulder belt properly. In a crash, the child
would not be restrained by the shoulder belt.
The child could move too far forward increasing
the chance of head and neck injury. The child
might also slide under the lap belt. The belt
force would then be applied right on the
abdomen. That could cause serious or fatal
injuries. The shoulder belt should go over the
shoulder and across the chest.
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