I would likely answer this as a quick “no” if I saw it posted, but if the essay is about what makes you lose time, and is lighthearted and ends with a reference about being teased at “nerding out” (verbiage not used in essay) could it possibly go over well to end with a =)?
I realize its not “professional” but if I were reading through hundreds of personal statements and the tone of the essay fit, I feel like I’d appreciate that =). Also considering they want to see who you are past your grades, and most of my essays are heavy as an aspiring trauma therapist and my coping mechanism is humor (I am quiet witty if I should say so myself =P) could it work to throw that little aspect of my “me-ness” in?