From the joke notebook of Happy Days Comedian, Roger Webber:

My world got turned upside down when I realized that Leather and Pinky Tuscadero were sisters, and not two unrelated women that Fonzie was bedding in the garage.  Leather, the younger sister, was just being looked out for by the Fonz.  Yeah right!  You know how us guys are!

I would have figured that noted playboy Fonzie would have had no qualms about getting it on with both of them.  I remember moments when he'd walk into Al's arm in arm with twin sisters.  What was his problem with taking a spin on both Tuscadero's?

Leather must have been a...LEZ-BEE-FRIENDS!

Things sure were weird back in the 50's.

But seriously folks, can you imagine Fonzie trying to turn on an iPod by punching it?!  Am I right?!