This week on Car Talk, Stephen is riding high--unwittingly so. He got new engine mounts in his Mercury, and now the car reeks of marijuana. Did his mechanic leave a little bag under hood? Elsewhere, 11-year-old Hannah's Dad is having a jolly good time blowing his car horn at her. Is she seeking mechanical advice from Tom and Ray on, say, how to disconnect the horn? No, she wants a prank to get even with dear old Dad. Also, our Physicist on call weighs in on the great bird poop- cracked windshield debate; Ray reveals his love for Fiat's new arrival on our shores; and proof that listening to Car Talk is great training for a career... in Interior decorating. All this and lots more, this week on Car Talk.