Nobody's perfect and Jay Z is proof of that sentiment. During his recent Magna Carta World Tour opener in Manchester, England, Hov got a little rusty on his lyrics, forgetting the words to the Watch the Throne track "No Church in the Wild." Can you blame a guy with almost 30 songs in his setlist and more than two decades of material? (That's a lot of lyrics.) So VIBE went out on a witch hunt to see if Hov was alone, and you'll be surprised at how many other artists -- Rihanna, Justin Bieber, Madonna and Christina Aguilera, to name a few -- have also suffered from short term memory loss onstage.