This switch

Not long ago me and Mrs Green were due to go to a concert after work so we needed to have dinner quickly in order not to be rushed.

 I am home about 30 minutes before Mrs Green so she put 2 ready meals in the oven and asked me to simply turn the oven on when I got in so the meals would be ready as soon as she got home.

I did as I was asked, dutifully, when I got in but when she arrived home the meals and oven were cold.......but the grill was nice and hot!!
This post-it has subsequently appeared on the oven, should I ever be asked to help with dinner again!