Remember how Jeremy Piven quit the Broadway production of Speed-the-Plow "because of mercury poisoning from eating too much sushi"? Turns out he's back on the chopsticks again, and getting so bent off the stuff that he's tweaking out in sushi restaurant bathrooms. The Post says he was restricting himself to vegetarian rolls on Saturday night at Chicago sushi restaurant Sunda, so maybe it was the sushi DTs that caused the Rush Hour 2 star to drop his BlackBerry into the toilet. But that doesn't explain why, instead of fishing it out for himself, he summoned staffers to pick the phone out of the toilet for him. You can't blame that on sushi withdrawal; that's just Piven's signature douchiness!