Any question answered...

Thanks all. I reckon crash position might be the winner. Now to work out why and who. And if it was crash boy who shat on the floor on Friday (at leaset he did it in the stall).

Thanks too for the insight on obesity - a massive arse would push things forward instead of backward. I wonder why I never thought of that before?
Could be an anxiety issue. Not wanting to physically touch the toilet seat. So kinda hovers over it.

Although this would seem much easier to achieve by raising the seat. But still.