AndyRM
Elder Goth
Motherf*cker surprises me when used by Americans, given their seeming aversion to using f*ck.
I've always thought of it in the same way that Brits/Aussies use "c*nt", in that it's versatile enough to be a term of endearment or an insult.
As swearing goes though nothing, absolutely nothing, will ever beat "f*ck" on its own.
That said, the chart doesn't take into account non English variations, where my favourites are "chinga", "putain" "faen" and "pendejo".