I started loosing my hair the day I met my wife (just a coincidence, of course). I Shaved it all not long after, although I had also shaved my head a few times before balding.
As for jokes....
My favorite line, being 6'5" is that I am just taller than my hair. I grew right up through the middle of it.
Then there is to old favorite, I'm not going bald, I'm just getting more head.

(kinda looks like me)