i would slightly poke the nose out of the garage, only leaving headlights and front bumper show. keep door half way down, make sure its dark as dark can be so theres minimal body lines showing. tease her. let her think. refuse to show or tell what you bought. just enough that she knows she didn't hurt you, that taking the 5 series was a blessing in disguise. and then when she continuously mentions it or brings it up... pull it out with Bambi
in the seat and slide sideways out of the driveway and take off!