R. Crumb Greeting Card: "Don't Mess With It" (Orange Car)Rare as hen's teeth vintage Robert Crumb greeting cards! Colorful and iconic, some of Crumb's greatest Underground images are beautifully emblazoned on these vintage novelty cards. Stunning and stimulating brain and eye candy for any occasion! This card features Mr. Natural driving an orange car and the dialog reads: I wish somebody would tell me what "Diddy Wah Diddy" means If you don't know by now, lady, don't mess with it! Color by Kim Deitch.