My father was really good with math. It's a funny thing, I don't remember my father or my mother being so mechanical-minded. My father always wanted to be a doctor, but he came from a really poor family in Georgia, and there was no way he was going to be a doctor.
The humor for me is how far above your head the signature is - it's dislocated from the sign of the artist in such a distinct way that it could almost be a self-portrait of a sort.