I'm with ErikHolmes... I just can't not contribute...
Have a swinging axe wired to the Dow Jones Index... When the market falls, the axe falls, if the market rises, the axe stays stationary... The way the US Stock Markets plummet on the smallest things your character would be dead in no time...
have your character become a slave who is put to work basically walking on a water wheel on land to turn it. After doing this for several months 16+ hours a day, with little food & water, your character becomes exhausted and slips being drug under the wheel and cut into pieces...
Your character is tied to a table. A stack of bricks is placed covering the body from head to toe, not putting too much weight on your character... Then a fire is built on the bricks and he is burnt to death by way of the heat transferred through the bricks onto his body...
the overused but ever amusing, step into a street and get hit by a bus out of nowhere....
Trampled by a horse causing a coma and subsequent death
lose control on a motorcycle going down a hill, hitting the barrier and being thrown over a overpass onto jagged rocks 15 feet below on the side of another road...
being caught in the undertow of a river/ocean and tiring before you can get out and drowning...
catching ghonnasyphlaherpalaids and dieing a very slow and painful death with seeping flesh wounds...
I think I'll stop before my morbid side shows too much more...