one thing im sure you cant do on a segway but can on a unicycle.
bunny hops.. if thats what you call them with unicycles.. but...
that and im sure unicycles have ABS (however primitive) while in loose ground or you kinda spin your tires a bit and kinda fall off.. kinda
as MattK shows us
http://www.chiefdelphi.com/forums/pi...gle&picid=8297