Because some of us are so forgetty that we lose the thought to turn off the oven between grab food and set food down.

I personally haven't forgotten the oven-off, but for other things, many times.

Just yesterday i forgot to put the coupon in my pocket after reading it and so got to the place and realized i didn't have it. It was sitting right nect to where i pit my keys, but didn't make it into my pocket.

Brain no worky.