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Unfortunately sabotaging your spouse or significant other takes a bit more work. You have to get into the car just before she does turn on the fart app and set it to either the turn signal or the left wheel button press. Then when she starts driving there should be some fun!
I am sorry to say that I did not prank my wife. What a wasted opportunity.
I should have volunteered to pre-heat the car for her and taken the opportunity to activate the fart app. It would have been amusing, AND a lesson to her to think twice before sending me out on an errand
I just read through this thread and considered that I have never in my long and interesting life seen the word "fart" repeated so many times. Well, at least since junior high!