It is not a guarantee, and I know you guys are just playing. Just from personal experience, I will be wearing the appropriate footwear when I ride.
And the statement that clips in "live traffic" is dangerous is completely untrue. When I am riding in traffic that is when I love the clips. The connection to the bike just by it being a fixed gear is great, add in clipless and it is amazing. I would actually say that riding those "pedals" that you have is more dangerous. No way I would have those on any bike that I own.