Me, I took my kids to school in the morning, taking my dog along with us for the walk.
When i arrived at the school I tied the dog lead outside the gates (because dogs aren't allowed in) and went into the school to drop the kids off.
I left the school, walked straight by my dog without noticing, walked all the way home and just as I reached my front door realised that I had left the dog outside the school gates.
Luckily she was still there when I dashed back, but it is a 15 minute walk at a brisk pace, so that's half an hour in which she probably thought no one was coming back for her. Boy did I feel bad.
Haha, now that is a spazz attack.