Flying away seagull in Santa Cruz

Friday I was in the office talking to a friend about how slow and bad focus his lens is.
I went so far as saying that if he uses it to photograph a bird, the only thing in the photo will be the bird's "butt".
Well, I went home trying to pick a photo for my photoblog and see this shot where I shot the seagull from behind... hahaha.
I remember I made people laugh when I chased the seagull with a Canon 10D and the big white lens ( for those non-photog out there, the Canon 10D is not a gun)
I have 2 versions of this shot, both my dad and a new photog friend like this one so I just post it.