At the bus stop on the way home I watched a male pigeon strutting his stuff in front of a female pigeon. Or possibly a female pigeon strutting her stuff in front of a male pigeon, I really couldn't tell. But it definitely looked like the fluffy one was trying to pull the dark one, who was playing hard to get.
I was thinking “why do you, stupid birds, have to do the head-banging thing just to step forward?”. And then they jumped up and flew off, and I thought “OK ya bastards, you win.”