The only one that might have actually affected people around me was the 2009 "swine flu"/H1N1. Nearly half of all students at my school were out sick at the same time. I never got it, but I almost wished I had just so more students were absent so the school would close down for 3 days to clean the whole place. We never got snow days so this would have been the next best thing. Sadly it didn't happen.