Wash your hands
Problem: people don't wash their hands after going to the toilet in pubs
We asked ourselves why people tend to not wash their hands after using the toilet in pubs. Our answer was: "Because they don't want to miss out on any of the fun chats happening while they are gone".
Our solution was quite simple, create beermats with really boring conversation starters that you can happily miss out on which leads you to take time in the bathroom and wash your pissy hands.