Article Photos: Thunder notebook: Kendrick Perkins, Tony Allen have unpleasant exchange 21/77

Oklahoma City's Kendrick Perkins (5) argues with the official about a foul during game one of the Western Conference semifinals between the Memphis Grizzlies and the Oklahoma City Thunder in the NBA basketball playoffs at Oklahoma City Arena in Oklahoma City, Sunday, May 1, 2011. Photo by Chris Landsberger, The Oklahoman