Like riding a what?

You know that old expression "it's like riding a bike" - well we need to come up with a new one. My new job has me going to meetings in buildings far from mine on the JSC campus. Fortunately, our division has a set of bikes which we can use to cut down on travel time. I discovered this two weeks ago and in the meantime have almost run into two people, a car, a large tree and a duck (the last being by far the most amusing). The two people moved out of the way, the car and tree stood me down, and the duck moved faster than I have ever seen anything move in my life...

...my apologies for ever making fun of their appearance.