I put a pigeon on my helmet 8 years ago[1]. Everywhere I go I see smiles. I really makes every ride fun. One of my friends recently started also doing it, so its starting to catch on.
Pigeonriding transforms me from an awkward software engineer into an interesting person who people want to talk to. I have only had a handful of bad experiences[2] with drivers and other bikers in 8+ years that I have been riding (a few of those years I commuted on a bike year-round).
[1]:http://www.pictureboston.com/blog/2011/08/14/a-leica-camera-...