I think I invented a trick..
What I tried to do, was to ride flat out towards a rail (a freestanding
rail where it's just a bar, nothing above, below, or behind it) and
then hit it with my stomach and do a forward roll about the rail -
taking the unicycle over the rail with the momentum of my legs.. and
then landing it on the other side and riding away.
this all sounded really incredible in my head.. but when I tried to do
it, I found the unicycle ( nimbus trials ) was much too heavy for me to
lift up just with my knees, and so I decided just to roll over the rail
without the unicycle and just let it fall to the floor.
This is exactly what I did.. but when I let go of the unicycle and
rolled over, the seat fell forwards and it's handle smacked me in the
mouth as I was rolling forward, upside down about the rail.
A nice fat, cut lip says that it's a bad idea.
Good in theory though.