We haven't paid much attention to Charlie Sheen's Twitter account since his headline-grabbing mania wore off earlier this year, but Sheen continues to tweet and dutifully sprinkle his messages with "#winning" hash tags all the same. And so it is that we must rely on "Page Six" to report that Sheen pulled a rookie Twitter mistake this past weekend: Though he meant to direct message "310-954-7277 Call me bro. C" to Justin Bieber, he accidentally posted it as a normal tweet, which set off an avalanche of calls to Sheen's cell phone. Why was he contacting Bieber in the first place? Well, the Biebs did pick Sheen as the most influential person of the year when Time asked him back in April, but maybe Sheen's just sizing up his friendly competition?