When I was in college and went to parties I always wore a red flashing light on a chain hooked to my pants that was extremely noticeable and tons of girls were always like wtf is that?? Then I explained that I wear it because I tend to get hammered and in case I pass out in a ditch somewhere it will be easy for people to spot me. They always thought it was hilarious. As an adult that would be a huge dlv alcoholic red flag though.