The first mock-mirage green flash I ever photographed was in 2003 from a boat in the Galapagos, and ever since then, I've been fascinated by them.
Green flash in Galapagos in 2003
On December 12, 2008, I photographed a green flash in Antarctica. Wikipedia says that it was a "mock-mirage" flash, where "indentations seem to 'pinch off' a thin, pointy strip from the upper limb of the Sun."
Mock-mirage green flash in Antarctica. 12 Dec, 2008
About half an hour ago, I saw the brightest mock-mirage green flash I've ever seen (off the coast of Mendocino in beautiful, clear weather). I've met people who say that green flashes are bullshit, but this one was so bright and obvious that it would have convinced pretty much anyone that they are real.