Hi,
A while back I mentioned that a kids’ cartoon “Tiny Planets” had
featured an alien learning to ride a unicycle. The other evening there
was another episode about unicycling. Two aliens: one tall, one short.
The tall alien had a unicycle with a long seatpost. The short alien
tried to ride it but couldn’t reach the pedals. They ended up adding
cogs and a chain to make a giraffe. Why they didn’t just shorten the
seatpost, I don’t know. 
Anyways, with two cartoons featuring reasonably accurately animated
unicycles, I suspect somebody associated with this series is a unicyclist…
Regards,
Mark.