Street Dogs helped Madame Tussaud’s Wax Museum unveil their Alfred Hitchcock figure in an event in front of Graumann’s Chinese Theatre. Contestants auditioned for the best blood-curddling scream while standing in a shower, a tribute to the famous scene in Hitchcock’s classic film, “Psycho.” Hitchcock leading lady Tippi Hedren (“The Birds,” “Marney”) was there to help pick the winner, whose scream will be immortalized in Madame Tussaud’s Wax Museum on Hollywood Boulevard when it opens in August.