Zany David Arquette strikes again — and wife Courteney Cox was the . . . er, butt of his latest wacky practical joke! Courteney, who’d just returned to their Malibu pad after a “Friends” shoot, hit the john for a pit stop. A moment later, David tiptoed up outside the door, giggling quietly, and . . . SHRI-E-E-EEK! Courteney freaked as the voice of Elvis suddenly warbled “Love Me Tender” — from the TOILET PAPER ROLL! David, in hysterics, told not-so-amused wifey he just couldn’t resist buying the novelty item! Warning to Arquette friends — he’s ordered MORE as Christmas gifts!