When you put the toast in the toaster, and watch it for a few minutes, waiting. You only realize about five minutes later that you did not push the lever down.
When you cannot remember if you locked your car or not because you were paying too much attention to that SOUND down the street, so you have to get bundled up and go out and check, and you get distracted by ANOTHER suspicious sound...
When you get a tattoo on a very sensitive, bony area and don't feel ANYTHING to the point of going to sleep. The tattoo artist shakes you awake with an assistant, because they assume you passed out and you're irritated because you were having a nap. Their shocked faces are something you'll remember a long time.
When you are having a BAD day, you're paying for something at the till then BAM you are home. You have no memory of how you got there. There is a chocolate bar on your receipt, and a wrapper in the bag, but you don't remember eating it. You're pissed off because chocolate bars are good and you didn't even get to taste that one.