My mom has this habit that she's become quite famous for, at least in our family.
Most nights, she can be found sitting on the couch, chatting with someone on the phone or tidying up around the house. No matter what she's doing, you'll see the same thing hanging out of her mouth....floss.
The woman flosses religiously. It's not a bad habit. In fact, it's a great one. A very hygienic one... until floss gets left lying around (to be fair, that doesn't happen often.)
Either way, she's reaching the younger generations with it.