Hypothetically you could just set up a tv and microphone in your house but nothing compares to squeezing into a karaoke room with your friends like sardines and getting to order food while you all collectively sing the world’s worst rendition of Gee by Girls’ Generation
You don't have to wait all night for it to be your turn or rent a private room at a karaoke bar!! It's as simple as searching any song on youtube + lyrics. And they sell really awesome portable speaker and mic sets now but be careful on a school night because your neighbors may file a noise complaint and the cops may come but ultimately laugh at you and ask you to turn it down and then you will laugh but say "ACAB" as soon as you close the door and then turn it down because consideration for others is an important value!