Use it to plug up leaks around the storm windows. Eat it to stay cool on those Chicago nights when you're afraid to open the window because of gunfire. Add some to your hot chocolate. Offer a reward. Figure out how tall the Empire State Building is by dropping jars of peanut butter from the observation deck.
Coat satellites with it to collect samples of space dust.
Pour it over Cheerios instead of milk. Makes a thicker, richer, more balanced breakfast. Restate all the laws of physics in terms of peanut butter. Use it to stop the clock during a particularly difficult test. Leave some out for the raccoons.