> > 1. Take sub-critical amount of U235 in left hand.
> > 2. Take sub-critical amount of U235 in right hand.
> > 3. Clamp the hands together.

Hmm... it's illegal to receive a radiation dose greater than 500mrem.  You
just received about 1000-10,000 rem and a pool of molten uranium :)
>
> No, actually that won't work.  Although it's not too healthy to do this,
it
> won't result in a sufficiently large uncontrolled chain reaction to be
> considered useful as a bomb.

What if you could clap your hands together at 5000m/s?
>
> I suppose it's unlikely that anyone has designed Microchip PICs into the
> control systems of any nuclear weapons.

You never know... a new PICLIST challenge?