Failed your SATs? No problem, just reload an earlier save.
Save Points
Most useful when: you have a huge test coming up. Or a big date coming up. Or really anything you wish you could rewind for.
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Invincibility Stars from the Mario Series
Most useful when: your significant other says, "We need to talk..."
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The Portal Gun from Portal
Most useful when: you're trying to cross the street and the light is taking FOR. EVER. to change.
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Potions from Final Fantasy
Most useful when: it's 3:30 PM and you're dying at your work desk, this close to death.