Ever since we were little, we’ve been told to “wash our hands”. But today and for some time to come this simple gesture is vitally important. In order to help spread the message – and show us how to clean our paws correctly – McDonald’s Russia and Leo Burnett created a pre-roll that’s a little unusual. It’s impossible to skip, reminding us that it takes a full 20 seconds to wash our hands properly. Dry them on a paper towel and you get full marks.