[Old Professer]

A hand cranked generator works exactly like a siren, the faster you crank the louder it gets. :>)

[Free Trapper]

In Mexico,people box up an old telephone generator and attach handles to both wires.

They carry the generators around and for a little cash you can hold the handles while the owner cranks it up.

After the shocking experience,your muscles thankfully and pleasantly relax.Seems to be a macho thing to take the fastest crank possible from the operator. :}