Kissing under the mistletoe dates back to a 17th century English custom. Back in the day, a berry was removed every time a kiss was made, which meant there were no kisses when there no berries. We seem to have since forgotten about the berry removal - allowing us to concentrate on the kissing!
So on your next visit to the store, pick up this poisonous, good for nothing, parasite and hang it in the MOST conspicuous place in your house. Then grab your spouse, your kids, the dog, the hamster, (okay, not the hamster) and SMACK away!