Have everyone write down their favorite Christmas carol (just one), as long as it is NOT Jingle Bells. Next have everyone write down five different numbers between 1-20 (depending on the group size). Start calling out numbers, and the people who have that number have to sing their favorite carol that they wrote on their paper. Carolers are not shy, so there should be a lot of singing. After someone has all five numbers called out that they wrote down, they win...BUT...they have to stand up and belt out Jingle Bells while doing a dance of their choice to receive their prize. If it's a shy group, you can give little prizes in the middle of the game for most pathetic singing, best solo, most original song, etc.