Back in our school days, whenever there was an off period or on a break time, we used to divide ourselves into two groups- one for the girls and one for the boys. And we used to play a singing game commonly called "Antakshari" in my country. where each side had to start their song with the last letter of the song sung by the other group. The group that couldn't come up with a song would lose the round. It was so much fun.