At –41 C, exposed skin freezes in as little as five minutes. Add in a little wind — say 30 km/h — and that time drops to less than two minutes. Temperatures like that carry a high risk of frostbite and hypothermia, and Environment Canada advises that you stay inside if possible.
Or you could do what YouTube user chrisgsauce from the Timmins, Ont. neighbourhood of South Porcupine did earlier this week: fill a pump-action water gun with boiling water, and let fly a cloud of vapour from his front porch.