Fortunately, Budapest's version was much more successful than the Ben Stiller film of the same name. In the film, the great Ricky Gervais played the castrato role of Dr. McPhee, but in the Budapest night at the museum, tourists and locals alike only had to pay 1200 forints (around six bucks) for access into over 50 museums, libraries and other venues.
DJs, dance troupes, Latin cuisine, and lots and lots of people. So many people, in fact, that wait times were up to an hour to get into the better exhibits -- namely an Incan artifact exhibit at the Museum of Fine Arts and a Ghengis Khan exhibit at the National Museum.
On a night like this, I found it best to see as many of the smaller exhibits as you can. Namely those you would usually put at the end of your list. For example, and no offense, the Postamuzeum (museum of postage and communication) where a rare stamp collection was displayed or perhaps the Zwack Unicum museum where you could learn everything that goes into making the most offensive alcoholic beverage in Europe.