Originally Posted by Zacharias

(Canadian usage)

IMPACT GUN - Intimidatingly loud tool supplied by shops to all under-trained staff. Primarily used to frighten customers, to ensure they do not venture into shop area. Late in the day, may also be used to drown out customers' verbal inquiries about their bill.

In the province of Quebec, by law must always be set to appropriate torque value for bolting drive screws to oceangoing freighters.