Some interesting ones but I soon got to one that is a myth (a duck's quack doesn't echo, and no one knows why) so started to doubt some of the others too- but I'll have a look at some more later
If you want to know whether a duck's quack echoes or not, you simply need to place it in an echo chamber with some recording equipment. Who would do that? The University of Salford, of course ;-)
http://www.acoustics.salford.ac.uk/acoustics_info/duck/