“Gun Shy” (** out of four) was a zany, contrived comedy about an addled and aging rock star (Antonio Banderas) whose wife (Olga Kurylenko) is held hostage and he is kidnapped while on vacation in Chile and this escapade subsequently involves the C.I.A. and deranged former fans. Tiresome story has a few laughs at the beginning but soon sputters and runs out of steam. Banderas is game as usual and seems to have modeled his performance on Slash, Ozzy, and Weird Al but this is a far cry from “This Is Spinal Tap”.