Here's a horse related one. My gpa had some folks coming to look at a mare he had for sale. He asked me to come ride her for them. I went to the pasture to catch her. Brought her in, tacked her up and got on. When I asked for a spin out of her the mare acted downright confused, here's me thinking wth is wrong with this horse, she's been at this reining gig for 5 years now. Well as it turns out I grabbed the WRONG sorrel mare! I was on one of gpa's broodmares that hadn't been ridden in years! Quite surprised she didn't dump my butt. Felt pretty stupid telling the people, oh wait, let me go catch the right horse. Moral of the story - don't own more than one sorrel with the same darn markings! :)
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.