My professor once asked me about a comment that said "// This is awful and you should feel awful, change this before handing it in. "
I had no excuse, I just told him time makes fools of us all.
That's basically what I was told. It worked, I explained the algorithm I was having trouble with, and that I just ran out of time.
He didn't deduct any marks or anything, he just said I should make an effort to make comments less self-deprecating.