Jeremy Piven got himself into another sushi drama Saturday night in Chicago — he dropped his BlackBerry down the toilet at restaurant Sunda. The “Entourage” star, who purportedly suffered from mercury poisoning in 2008, stuck to vegetarian rolls at the Asian eatery owned by entrepreneur Billy Dec. Staff members fished the phone out and packed it in a bag of rice to help dry it out. Later, Piven and Dec headed to Rockut Bar & Grill. Piven’s rep didn’t get back to us.