You often see human skulls used as drinking vessels in horror films. Well, the practice was real, though a little earlier than you might think.

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0017026

http://www.bbc.co.uk/news/science-environment-12478115

"Ancient Britons were not averse to using human skulls as drinking cups, skeletal remains unearthed in southwest England suggest. The braincases from three individuals were fashioned in such a meticulous way that their use as bowls to hold liquid seems the only reasonable explanation. The 14,700-year-old objects were discovered in Gough's Cave, Somerset."