Birds of a Feather Chase Birds Together

I helped an old man chase a stowaway pidgeon off the train before it departed the station today. The other passengers seemed unaffected by the ordeal, but I thought was quite fun and he really seemed to get a kick out of it, too (the man, not the bird). We couldn't stop laughing about it afterwards, although soon I was laughing more at the man's jolly toothless grin and his sheer amusement than at the pidgeon.