I got buzzed by some kind of velociraptor on the PSP near Lake Gwelup
I had a similar experience near there last week - was minding my own business and too surprised to see what it was, though and very glad to have had glasses and a crash helmet on.
or a small owl
You want to watch those, they're evil. One came down the chimney of my house in the UK a few years ago, covered everything in soot and guano and in the process managed to stove in the titanium dome tweeter of one of my speakers. My wife found it in the living room and I'm not sure which was more surprised.