Nearly one and half years after a Merrill Lynch employee defecated on the floor of a bathroom near a bond trading desk at the bank's headquarters in lower Manhattan, it looks like it may have happened again. Employees say that someone has left "a turd" in the stairwell connecting trading areas on the fifth and seventh floors. It's not known when the crappy asset was deposited or who left it there, according to people familiar with the (fecal) matter.