hitler's dart bomb?

http://www.dailymail.co.uk/news/article-1093499/Hitlers-pub-dart-bomb-The-secret-Nazi-weapon-drawn-terrorise-Britain.html

I suppose it's possible that someone was taking this seriously, but I would be cautious here. Yes, there were all sorts of incredible military ideas floating around by 1945, (on both sides), but someone making a few sketches on a piece of paper hardly counts for much, in terms of serious possibilities.