Definitely, the punctuation in a text message if it matters, because the person receiving the message has a chance to understand more clearly what you are trying to say and of course the misunderstandings are avoided which often occur due to lack of punctuation and question marks or exclamation. These days mainly young population they’re going exactly this, in the population of today, especially the young population young often have more written conversations that verbal and here is where the problem arise with the lack of punctuation, exclamation marks and interrogation. Another points is that people forget punctuation use them in any type of document, being accustomed to never use in text messages.
Not just humor, but the overall tone of your application essay is remarkably important. It's also difficult to get right. When you are asked to write about your accomplishments, those 750 words on how great you are can make you sound like a braggart. Be careful to balance your pride in your achievements with humility and generosity towards others. You also want to avoid sounding like a whiner -- use your essay to show off your skills, not to explain the injustices that lead to your low math score or failure to graduate #1 in your class.