Kiss the Librarian Enamel Pin

Classic TV Show Pin from Buffy The Vampire Slayer. 

The mug originally belongs to Rupert Giles, Sunnydale High's school librarian and Buffy's Watcher.

It becomes iconic in the Season 4 episode "Something Blue". While chained up in Giles's bathtub, the neutered vampire Spike uses this specific mug to drink pig's blood through a straw