But just as swiftly as sales spiked, they crashed once the so-called employee discounts disappeared.

Watching games, in contrast, belongs firmly to the giant screens, so much so that sales of high-end televisions spike before events like the Super Bowl.

Gas prices then plunged, and light-truck sales spiked.

Similar to Space Invaders for the Atari, sales spiked after its release.

But small-car sales spiked in September, and sales for large sport utilities dropped, a reaction to high gas prices.

Afterwards, while the film was number one at the box office, sales of the car spiked.

It surpasses "Womanizer," which sold 303,000 copies during Christmas week 2008 (when sales traditionally spike).

City officials are unable to say how much these sales spiked during that time.

Week three sales spiked to 156,000 following Houston's appearance on The Oprah Winfrey Show.

Many gun store owners say that sales of assault weapons spiked briefly in September and October.