I teach math at a local community college, and I had an experience
 Tuesday night that was too funny to keep to myself. In all of the
 classrooms at the college where I teach, we use black dry erase
 markers on whiteboards. They can get really messy in a board-intensive
 class like math.
    I'm always leaving class with black smudgy residue all over my
 hands. I teach an evening class, and when it's over, I go straight to
 my car to go home. I hate to walk to the bathroom at the opposite end
 of the building just to wash my hands before I leave, so I end up
 going to my car with messy hands and getting black smudges all over
 the light gray interior of my new Mustang.
    Tuesday night, I was so proud of myself and the idea that I had
 come up with, that I had to tell my Algebra class. I pulled some
 Wash-Ups towelettes, in their small square individual packets, out of
 my briefcase and held them up to show the class.
    I said, "Look what I got to use after class. I'm so sick and tired
 of messing up the interior of my car!"
    I got a bunch of blank stares until someone finally said, "What are
 they?"
    After I told them what they were, one girl said, "We thought they
 were condoms!"