Ovu Mobani Mask from "Dead Man's Party"

This iconic "Ovu Mobani Mask" was screen-used in the episode "DEAD MAN'S PARTY" in Season 3 of Buffy: The Vampire Slayer. In this episode, Buffy's mom "Joyce Summers" (played by Kristine Sutherland) imports a Nigerian mask for an art exhibition and hangs up in their home.

Unbeknownst to her, the mask contains the spirit of a Nigerian demon named "Ovu Mobani" which causes the dead in Sunnydale to rise as zombies and race toward the mask, killing every living thing they encounter. According to Giles, "Ovu Mobani" means "Evil Eye".