Only use your heating devices for their intended purpose

I had just made a cup of coffee and then decided to run out to the vending machine; I thought to myself, "I can just set this cup of coffee on top of my space heater and it will keep warm warm while I am out." No such luck. I returned and I picked up my mug, expecting a pleasantly warm cup of coffee. But, the space heater had heated only the handle. I was forced to drink my lukewarm coffee while wearing a leather glove to protect my hand. Let this be a warning to everyone.