Howard and Amy spend some time together for the first time ater Pennys warning never to get into a car with Howard alone. Thank goodness he got married | The Big Bang Theory on Comedy Central, DStv Ch122
Amy and Howard don't even arrive back at the apartment but go karaoke singing instead, BUT! As Raj's "moral of the story" is that the REAL objective was to have fun, one could argue they won the whole thing since they enjoyed themselves so much they didn't even care about the prize anymore.
maybe to not obstruct the view when there are characters in the back seat? in this scene there is not but it would look weird if it were there in some scenes and not in others