If you eat alot of rough fibre they float, and also if you have alot of fat in them (then they smell), but you can have alot of fluid and fibre and they sink.. Then you go down to whether you leave 'skid marks' on the pan and if those marks flush or have to be brushed away. See I really love my job! Basicaly it all boils down to the amount of fibre and water in the diet!!
We should all be aiming for a large bore soft number 4!!! You go for it Esemotto!