There is a new post on the Beyond Cost Plus Blog about the tradition of "Cheap Tuesdays" at the movie and how they aren't just an effective pricing hurdle, but a self-propagating pricing hurdle – one that becomes even more effective one implemented.

The basic idea is the promotion appeals to one type of consumer – those most focussed on saving money – which in turn further deters those likely to be willing to pay full price. Since the goal of the original hurdle was to avoid discounting to those customers the whole thing becomes even more effective.