I hate drinking cold coffee!
It acquires awful sour taste when it is getting cold.
So I‘d like coffee cups with installed thermometer be invented. Imagine curios little cups with no less little thermometers informing you that if you are not likely to spoil your mood and become annoyed you'd better not to drink it. The time of enjoying your coffee is up. Sorry for you, guy…
So lovely clever cups!

Cool, isn't it?