I don’t visit the doctor frequently (less than once a year) but last year I went to the doctor and as part of the paperwork, I encountered a question about how much pain I felt (shown above).

This is the Wong-Baker FACES Pain Rating Scale (which seems to be available online).  I thought this was a great way to ask about general pain severity that would be useful for people with another primary language or children–precisely why it was developed.  We humans have a very tuned sense for faces and probably emotions.  This scale takes advantage of both with caricatured faces and somewhat extreme emotional representations.