A Magicioneer's Unicorn

What is the probability of meeting a dinosaur on a walk? A common joke says that the probability of meeting a dinosaur is 50%: either you will or you won't. But what about the walk that ends up fulfilling the cherished fantasy of millions of fans around the world? I got lucky as hell today. I fucked a wonderful enchantress on a unicorn. I mean, we did it on the back of a unicorn. And I can tell you, it was worth it...