Merion, especially back 9, although front 9 is not exactly high in my Christmas card list. Any course where I have 3ft for birdie followed by a pitch shot for par, followed by 3ft for bogey is just horrible, and I can seemingly manage the same routine on multiple holes on Merion.
Its like crazy golf meets Disney horror film. Which is a shame as it looks like a lovely little track to actually play a round on.