Have you ever been shooting some insect, who is lounging about... letting you shoot it at will? Then you get into this deep focus, and concentrate on getting the perfect shot since the bug is modeling for you. And then...
A massive spider that you didn't see leaps out, drags the helpless fly to its hole. Of course, on the viewfinder it looked as big as a building.
That just happened to me. It really freaked me out haha. I didn't even see the spider (or its hole) until it pounced. Even scarier, after reviewing some of my photos, I can see in the background (in the darkness, I was shooting in the night) the slightest reflections off the spider sneaking up.
Has this ever happened to you?