This is (probably) possible, but not likely.
What if both Senator Clinton and Senator Obama each manage to find a way to make it to the convention with about the same amount of delegates? After spending the next several weeks snarling and clawing at one another?
What if at the convention both the Florida delegation and the Michigan delegation end up not being seated (which immediately depresses the Democratic base in each state for the general)?
And what if, even without Florida and Michigan, Harold Ickes/Bill Clinton are able to use their long knives in the convention's smoky back room and swing enough super delegates to Team Clinton's side so that she ends up with the nomination?
Well then, that would be interesting.
Would there be rioting in the street? Probably not.
And then hello President McCain!