Well, for anyone doing this, another thing to bear in mind (apart from the whole lethality issue) is don't turn it backwards.
Some vacuum pumps can have the vanes damaged if this is done.
Give the man a cigar
.
The accessory drive section and components contained there on are designed to rotate in one… and only one direction. You will not cause any harm to the alternator/generator, hydraulic pump, or oil pump… but the vacuum pump??? you can sure hurt that component.