A comedy sketch that aired during the MTV Movie Awards in which Ben Stiller, Jack Back and Robert Downey Jr. talk about making a viral video for their upcoming Tropic Thunder movie was pulled off YouTube after it became a viral video itself. Accordi ng to several tech websites, YouTube removed the video after receiving a "takedown notice" from Viacom, MTV's parent. The takedown was originally reported by the website BeyondMadisonAvenue.com, which commented that it appeared to be "the epitome of iron y. A viral video about virals not being allowed to go viral." Viacom, which has sued YouTube for $1 billion alleging copyright infringement, apparently has not demanded that the video be withdrawn from other video websites, including FunnyOrDie.com (http: //www.funnyordie.com/videos/4a4a8a64ff).