Guillotine. You'll know right away if it was effective or not. It is quick and needs no energy, just gravity.

Imagine, hearing the blade sliding down.

Hmmm, another thought - does the brain keep working for a while with a severed head?

__________________
Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport