I got pwned by a little old lady with a walker today... then I hopped on my bike and showed her what was what.
Dropped her good I did.
I have a few friends that ride bents at ludicrous speeds and one can even put up a good challenge on climbs (2 wheeled 'bent) but he is a freaking animal.
The friend with the cat trike has a Bionx and I was pretty blown away when I rode it... there is something about cruising effortlessly at 40 kmh and then firing up the assist to find yourself doing nearly 60 kmh.