Bring mistletoe headband. Ask if they know what mistletoe is. Explain that when someone is under the mistletoe they get a kiss! (Really play this up, it's funny to get a reaction - from kids and teachers alike!) Explain that a teacher is going to wear the mistletoe and if we think that class sang really good that whole class gets a kiss! (a chocolate kiss, haha! - pull out the jar of kisses now and laugh away! bwah haha!). Make them work for it and really sing for you, then invite them up to get their CHOCOLATE kiss. :)
*Not all Presidencies may go for this. - you be the judge.