There's an episode in which curly is talking to moe. Curly then is repsonding to a girl who's either in the room or him and moe are talking about. Curly does the 'wolf call' while looking upwards towards the ceiling. Moe then dumps some ashes off a cigar into curly's mouth. Curly then sort of chokes and coughs and says why'd you do that.
It was a really funny episode for me.