12只蚊子和5个人

As summer arrives, mosquitoes and flies run rampant. Somewhere, not far from the ground, 12 mosquitoes line up in formation, waiting for their prey to appear. Soon, a tall man comes along. Caught off guard, the mosquito army swoops down and swarms him, biting him from head to toe. The man thinks it over and decides that being bitten alone is too unfair. He counts the number of mosquitoes and instantly comes up with a clever idea. The man pulls over a sturdy fellow, and just then, the mosquito army attacks again—this time, each man is only targeted by 6 mosquitoes. The tall man secretly rejoices, while the sturdy man thinks of a way to reduce his losses, so he brings in another victim. This continues until a fifth man appears, completely shattering the perfectly balanced equilibrium... This film won the Science and Education Award at the 2nd Shanghai International Film Festival. Synopsis from Douban (https://movie.douban.com/subject/3024612)