Hah! This is great.
But it's good luck!
For who? You or the bird? My life is lucky enough without being crapped on.
Both, the bird gets to feel much more comfortable and you are assured via superstition that you'll be lucky for some undisclosed amount of time :D
HA- Great image Tim! Though I feel as a New Yorker, shouldn't you be immune to this by now?
I just got better at avoiding birds...