2 Mama Burgers on Helium for $4 at A&W

In June 2006, A&W celebrated 50 years in Canada.

In the United States and Canada, burgers may be classified as two main types: fast food hamburgers and individually prepared burgers made in homes and restaurants. The latter are traditionally prepared “with everything”, which includes lettuce, tomato, onion, and often sliced pickles (or pickle relish). Cheese, either melted on the meat patty or crumbled on top, is generally an option.

The speed of sound in helium is nearly three times the speed of sound in air. Because the fundamental frequency of a gas-filled cavity is proportional to the speed of sound in the gas, when helium is inhaled there is a corresponding increase in the pitches of the resonant frequencies of the vocal tract. This causes a reedy, duck-like vocal quality.