Dear sir or madam,
Perhaps you would not be taking up three parking spaces if you weren't eating cake while driving. I'm sure the other patrons of the Dollar Tree would also appreciate you putting the fork down, strapping your frosting covered fingers to the wheel and parking within the yellow lines.
Don't get me wrong, I've been there. Who hasn't, in a moment of weakness, gotten BBQ sauce all over their new shirt while trying to eat a Baconator and make a left turn simultaneously? But there's a difference between surreptitiously eating Arbys so the other drivers won't see your shame and eating cake while parking.