"I'll sharpen a stick of mistletoe"

In Norse mythology, Odin's son Baldr is impervious to harm, his mother Frigg having made everything on the earth promise not to hurt him. But Frigg forgot to ask the mistletoe plant. When the troublesome god Loki learned of this he fashioned a spear from the plant and used it to bring about the death of Baldr.

 

Mistletoe
GNU Free Documentation LicenseMistletoe - Credit: Eli+