Oil/cars

If you're going to check your oil in your car, drive the car for a mile so that the oil is at a performance level when you check it; if you check oil without having recently driven you'll inaccurately read the level.

Air/tires

Optimally, you should check the air in your car's tires every time you fill up for gas. However, once a month works just as well and is equally as important- low tire pressure results on more strenuous wear-and-tear on the tires causing them to not last as long. Also, improperly-inflated tires lowers your car's MPG.

Quicktime/Screen Saver

On an Apple computer, the Screen Saver/Energy Saver functions will not activate if Quicktime is playing a movie.