This ALS ice bucket challenge is hitting the highest echelons in Hollywood. Here, Paramount chief Brad Grey takes the plunge, egged on by Tom Cruise and Chris McQuarrie. He in turn nominated Chris Nolan, Brad Pitt, Michael Bay and Howard Stern. Grey was helped by Johnny Knoxville, and you can tell Grey’s stature by the ice bucket aftermath: Knoxville always punctuates a prank like this with a nut shot to the victim. Here, he demurred. And that is why we might yet see Bad Grandpa 2.