That was pretty cool, gave me a few chuckles.
I recognised the cause of at least one of the quad ones, propellers make a whole new sound with only one blade huh.
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Bit of info on the cause of some of the others would be good though.
I just ordered some CF props from Banggood. Be interesting to see what they are like.