Ninja Wren!

While photographing some Splendid Fairy-Wrens in Pemberton earlier this year, there were two wrens posing on top of a fence post. (In Western Australia, they are often referred to as "blue wrens".)
I captured a number of frames of these two birds with my Canon EF 70-200mm f/4L lens. It was only later that day when I was reviewing my photos on my laptop that I noticed that I had captured one of the birds in mid-air, looking like it is performing a martial arts kick on the other bird!

I've included a couple of other photos of the same birds below, in some more "normal" poses.

pair of Splendid Fairy-Wrens