Whats the Worst Insult?!?!

Miguel Tejada flipped the bird to the Blue Jays fans, Titans are spitting on each other, Danica ran out of gas, what's next?!?!?!?

This is an age old question but it still needs to be answered... What is the worst insult that one person can give another person? Is it the finger? Is it punching them in the face? Is it spitting on them?

Personally, I tend to think that spitting on someone is the ultimate insult (more on that later tonight).

What do you think?