In Norse myths, Odin's wife, Frigga, made a charm to protect her son Balder from air, water, fire, and earth (as mistletoe grew on trees as a parasite, it wasn't considered a part of that batch). Loki killed Balder with a dart made of mistletoe. In her grief, Frigga swore that mistletoe would never cause anyone any harm ever again, so she is said to kiss anyone who passes under it.
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