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Those scratch-and-sniff cards the energy company sends to customers to teach them to recognize the artificial smell added to natural gas? Turns out they work pretty well.
People stand on the sidewalk in downtown Great Falls after being evacuated due to widespread reports of a natural gas smell in the area.

Reports of a natural gas smell sparked the evacuation of several buildings in downtown Great Falls on Wednesday morning, but it turns out scratch-and-sniff cards were to blame and not a widespread gas leak.
http://www.greatfallstribune.com/ar...gas-smell-downtown-Great-Falls?nclick_check=1