Mooning the Cheetahs

There's a fine line between tragedy and comedy that often get blurred. This is often true when it comes to celebrity deaths. For example, how long is it going to be before Michael Jackson jokes are OK again?
I would like to propose a simple rule of thumb about such celebrity demises. The more tragic a celebrity's death, the longer it takes for it to be funy. For example, Princess Diana jokes had a wating period before they were socially acceptable. However, David Carradine, who died in an ill-conceived attempt at auto erotic asphyxiation, becomes subject for mockery almost immediately.
I call ths the "Mooning the Cheetahs" rule after a Dilbert comic stirp on ettiquete which says that is OK to laugh at demise of others as long as said demise is so hilarious and deserved that it becomes a health hazzard not to laugh. The example given is a man who died, as the name of the rule implied, whilst mooning enraged cheetahs.
With this simple rule, Michael Jackson jokes should be OK agian in about a week.