Camshaft timing when the sprockets are ONE tooth off from straight up.

I just remembered another one.
EVERYone I know calls them "Head Bolts".
Not him. He calls them screws because according to him, a bolt is retained by a nut, not just threads cut into a casting.
Bell housing screws?
Door hinge screws?
Intake manifold screws? Doesn't that all sound really weird?