For what it's worth, I believe that it doesn't matter if the knife is sharp or dull, you are more likely to cut yourself when you are careless, not when the knife is dull or sharp.
I know the conventional wisdom is that you are more likely to cut yourself with a dull knife because it's harder to cut with a dull knife. My reasoning is that the knife gets dull over time and as it gets duller, you automatically compensate for the dullness so it's not an issue.
The difference is that a cut from a dull knife hurts more.
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan