What's your missed shot?

We've all had one of those moments where we saw something that would make a great photo, but either didn't have a camera, or couldn't get the shot in time, so what's yours? Which missed opportunity sticks in your mind?

I've got two, and they're both quite recent. The first was a cat in my garden. I was sitting in my chair watching TV, and I noticed something in the corner of my eye in the garden. I looked up, and there was a black and white cat strolling along an animal trail towards the house, with a mouse almost perfectly centred in its mouth. The cat was perfectly framed along the path, with trees and greenery in the background that I know from experience blur nicely with my zoom lens. Unfortunately, my zoom lens was attached to my camera in another room, where I'd been taking the photos from the previous day off.

The second was a huge bird, a Cormorant I believe. It was sitting on a large pole in a nearby lake, sunning itself and preening. I took a load of photos over about half an hour or so, but couldn't get one that I was happy with. They were decent, but the bird was just sitting there, so nothing particularly interesting. I swapped hands with the camera for a while as my arm was aching, and the little bastard stood up, squirted a massive stream of shit into the water, and settled back down. The whole thing only lasted a second or so, and I couldn't get the camera back up in time. It barely moved again before I had to leave 15 minutes later >.<