Today is Setsubun, or the last day before spring. On this day, it's customary in Japan to throw soybeans out the window of your home, shouting "oni wa soto, fuku wa uchi" (鬼は外、福は内), or "demons out, good luck in!" I guess the demons are lured out by the food, like a magical mousetrap. Another theory says that by pitching the beans out, you're blinding the imps, keeping them from being able to see their way in.
I didn't have any soybeans around, so I used dry kidney beans. I hope demons like kidney beans.