Needed:

1) Fast convertible 2001 Mustang Automatic(Just steal the damn thing… you're dying. What the fuck) (Oh Hell. ANY convertible will do, as long as it can do 0-60 in six seconds)
2) 300 yards nylon cord
3) Solid Oak tree
4) 300+ yards of straight road, leading into town (preferably congested at lunchtime)
5) Duct tape

Ok. Synopsis:
You drive to the outside of town, yet within view of downtown… back the car up to the Oak tree, facing downtown. Keep car running.
Tie one end of nylon cord around Oak tree, tightly. Double it.
Climb back into death car and duct tape your right foot (carefully) to accelerator.
Fashion crude noose of other end of nylon cord; tighten around neck.
(300 yrd coil of nylon cord MUST be neatly laid in the rear seat for proper effect)
Carefully tear off 3 foot sections of duct tape and try (try) to tape your hands to the steering wheel. This will be the most difficult task.
Now. You have to figure out how to shift into ‘drive’. If you really want this, you'll manage.
When you engage the transmission, floor it and smile.

Soon, your head will pop off like a forgotten bottle-top.
The car will careen into town, carrying your stupid headless body behind the wheel… and your foot will press even harder on the gas, because of the spasms of the body, having lost it's head…

KABOOM

What better way to go?