I recommend strangling them then wait till darkness and attach the body to 1,000 helium balloons! OR Send them on holiday with the McCanns.
Sending them with the McCanns is a bad idea as you'd lose out on the vast fortune to be made through donations and lawsuits
As a KwikFit fitter, I sometimes don't fix wheels on securely just for the craic. There's usually no need to dispose of the body as they tend to be consumed in a fiery ball when the car veers out of control down the motorway.