SAVE THE WAVE!
Many MINI people like to wave at their fellow MINI peoples motoring about. Unfortunately a large portion of other owners are oblivious, texting, or don't even realize they are in a fun car as they commute along without even so much as a third pedal. Then there is the guy white knuckling it around the curves of the mountain roads who should probably have all fingers on the wheel (it's ok if a wave goes unreturned under these circumstances, all is forgiven. Wave safe fellow motorists.) This decal is for the wavers to get the memo to the non-wavers. If the campaign doesn't work you can always join up for the nearly infallible Jeep or motorcycle wave, which as fellow members of both have reached ridiculously high percentages of grinning one handed drivers.
It's big enough to possibly even grab the attention of a non-waver. Put it on your windshield and see if you can get those others to notice their brethren and maybe even wave back. Let them know life moves pretty fast, if you don't look around every once in a while you might miss it. You are in a fun car, wake up and act like it. WAVE DAMMIT!