The mistletoe plant is largely known for a manufactured characteristic: It's the green sprig with white berries that hangs in doorways during Christmas time, requiring those who meet beneath to kiss. But here's the thing about this festive accessory: It's a parasite.
Yes, the mistletoe attaches itself to other plants and sucks the life out. It's also one of the few plants that actually propel its seeds out of its own berries. Being a makeout-instigator may be the least interesting thing about mistletoe.