Article Photos: Thunder notebook: Kendrick Perkins, Tony Allen have unpleasant exchange 9/77

Oklahoma City's Thabo Sefolosha (2) defends on Memphis' Tony Allen (9) 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