I love show­ing my friends YouTube videos when they come to my place, but I hate shak­ing that mouse to keep the screen from dim­ming. Some­times in protest I turn the screen/power sav­ing off, but then I for­get to turn them back on. Headache!!!
So I finally got sick of this and installed a slick lit­tle pro­gram called Caf­feine. It’s a menu bar app that keeps your com­puter awake. Down­load it, drag it into your Appli­ca­tions folder, then dou­ble click it to run it.

One click fills the cup and keeps your com­puter awake…
…and one click turns it off and allows your com­puter to use the screen/power saver.
Super sim­ple, and it works. Awesomeness.

I only wish that I could decaf­feinate myself that easily…