Just kidding. While this may look like preparations for the coming invasion of radioactive lizards, this is actually a part of the annual Setsubun festivities. Marking the beginning of Spring in Japan, people tend to throw roasted soybeans at others dressed as demons, while chanting “鬼は外! 福は内!” Or, if you can’t read Japanese, because who can’t do that, “Demons out! Luck in!”
The beans are thought to symbolically purify the home by driving away the evil spirits that bring misfortune and bad health with them. Then, as part of bringing luck in, it is customary to eat roasted soybeans, one for each year of one’s life, and in some areas, one for each year of one’s life plus one more for bringing good luck for the year to come.
Gosh this looks like so much fun.