I know many people including myself have been wondering why a ball this large would ever be needed, and/or why is the GDC so cruel (in a good way) to us when designing these games?
Well I think our team found the answer on why trackballs exist on this planet.
Drumroll please!
I present to you… HORSE SOCCER!
Where can I find a 119.5 lbs horse? =)
That’s only powered by the battery, stored air pressure, and stored mechanical energy? That’s a tough one!!!
Perhaps here at Minihorseworld.com!
Who know, it may already be in size restraints. Just need to work on that whole “powered by one 12v battery” thing…
what are you leaving a half a pound for
Bumper mounts? 
I do have to feed the horse you know? The horse will gain weight when it eats. =)