<p>I would say that talking about one of very many idiosyncrasies is perfectly acceptable and fine, but you have to keep in mind who your reader will be. You want to get a point across that is a reflection of who you are, and what message do you want to leave the reader with? Is one insight into who you are, one thing that you do, sufficient? Im not saying that it cannot be, but I would suggest that making sure that it is sufficient. I hope that made sense. You have options for Tufts essays, and you want them to know who you are. Just make sure you get across what is most important about you and what you think that they should know.</p>