The next time you want to go out or celebrate your birthday with a small group, and possibly rap “Gettin’ Jiggy Wit It,” reserve a private karaoke room at Ms. Kim’s in Flatiron. Each room costs $120 per hour, fits up to 10 people, and has a special air filter that ensures you’re not sharing air with any other rooms. We had a dizzying amount of fun on a recent trip, in which we belted out ballads such as “Mr. Brightside” and “Just the Two of Us,” eating delicious karaage and tender garlic soy chicken wings, drinking many rounds of their tangy “Pear Planet” cocktail with rosemary syrup and lemon. Ms. Kim’s is one of the best places to celebrate your birthday in NYC right now, especially if your friend group is roughly the size of a small brass band.