This game is very simple and can be played with two or more teams. Sometimes this is fun to do with guys against girls. Pick a song theme (at Christmas choose Christmas songs, with a younger or more ignorant group you don’t even need a theme- any song can be open game) and let the singing begin.
The object of this game is to keep coming up with songs longer than the other team or teams. One team starts and sings a line of one song. Then the other team has 5 seconds to start singing a line of another song. Then the other team has 5 seconds to sing a line from yet another song . . . Teams may discuss and plan out which song to sing while the other teams are singing.
The first team to repeat a song, sing a song that doesn’t fit that category or just not sing within 5 seconds is the loser. If more than two teams play, sit losing teams out until one team finally prevails.