If in season in your area, go apple picking at a local orchard (organic or low-pesticide) and give out apples. Use Hallowing as an opportunity to educate your neighborhood's youth about eating local and ask the pointed question, "Does everything have to be sweet?" At the very least, give your guests a choice between an apple and a piece of candy.
chrisbaskind There's something fitting about going out and picking your own apples this time of year (or buying a pumpkin straight from the field in which it was grown). Great tip.
There's a more exciting DIY microwave option. At a local farmers market, buy popping corn still on the cob. Put the cob alone in the microwave for a couple minutes. Watch and smile as the kernels pop off the cob. Stop the microwave when more than two seconds pass between pops.