I discovered a (lame) party trick some microwave ovens are capable of.
Many microwaves will let you set the power to 0% by pressing the power button then 0 or 00.
You can then put a cup of hot water from a kettle or the hot water tap in the microwave on 0% power for two minutes and it will come out colder.
Bonus points if you have a thermometer at hand.
Kettle doesn't have 90C tea settings? No problem just boil at 100C, then pop in the microwave for 2 minutes at 0 megawatts. It is even faster if you live at altitude!
Colder than if you'd just left it on the table for two minutes?
Clearly you need one of the special commercial microwaves which has a -800W setting, to suck the heat out at a much higher rate.
TIL microwaves can double as a Blow Air Across It machine.
If one person in the house can't tolerate very hot foods, it could be useful for eg cooling off grandma's bowl of soup so she doesn't need to wait.