About No.10 theese are not nails. Theese are tees. Used to elevate golf ball from ground for starting shot. Experienced golfers prefer bambu because if you plant it too deep clubhead might fail to lift it of ground then bamboo breaks on the impact and there for does not break the accceleration of the golf club nor deviates its trajectory.
The bit about croissants is false. First, most French people would die rather than use margarine (it's butter all the way). Second, the shape is the baker's preference, nothing to do with ingredients. Yes, I'm French.
Cheers!