I went for a drive on the coast,early morning,a month back and had a BMW M3 with the top down behind me. It was a foggy and wet morning. The guy kept using his wipers to clear the windscreen. I was mightly impressed and when he pulled next to me, I rolled down my window(F430) and yelled "Top down!" while giving a thumbs up. The man looked a little confused and simply nodded. About 30 sec after I did that a thought ran through my head "What if his top simply doesn't go up and he HAS to drive with it down?" The car looked pretty beat up.