When my youngest sister was in high school, they at one point handed out anti-drug bracelets (think Lance Armstrong bracelets) during her math class. She snipped hers open, introduced a half twist, and taped it closed, forming a mobius strip. Then she wrote on it, “Do Math, Not Meth.”
When she learned that her math teacher shared this anecdote in her college recommendation letter, she was horrified.
When I learned all this, however, I loved her just a little bit more.