Stand at the top of a tall structure and make sure that there is something relatively soft below.
Tie cheese wire around your neck - tight enough that it won't slip off under tension but loose enough not to choke you.
Tie the other end to something solid on top of the structure. Make sure that there is a good six or seven feet of slack.
Now stand at the edge and glue your hands to the side of your head. Wait until your hands are glued solidly to your head.
Now jump off the structure. It'll only hurt for a second, when the cheese wire runs out of slack and slices through your neck. The overhang should stop you from bashing your now-severed head against the wall of the structure when the cutting motion jerks your body backwards.
This has the excellent effect of causing whoever finds your body to think that you have pulled your head off.