I was working on my 300SD in my garrage and had the hood in the full upright position. I needed more light in the engine compartment to see what I was doing so got in the car and backed out without lowering the hood. The top of the grille cleared the top of the garrage but got stuck on the "bulge" that the grille has in the center. I was driving slow and noticed I snagged the garrage and stopped. I tried to lower the hood but managed to get the car wedged in the opening. I was able to drive the car back in and only dented a grille strip and ego.