There is a multitude of reasons for someone having one unclipped fingernail: 1. Many cultures use it as a sign of wealth. Since nobles do no manual labor, their fingernails are not worn down. 2. No need for Guitar Picks. 3. Safer than a Q-Tip when cleaning one's ears. 4. Easier to pick one's nose. And last, but not least, the reason that wins the award for most humorous: 5. Natural Dope Scoop. I'm not assuming that Jenn does drugs, I'm just listing off a the reasons that I know of.