Uchicago interview, what to expect?

Has anyone gone on a Uchicago interview or know anything about it? What should I expect? Pressure style? easy? Help a brother out on his first interview.

I know one of the interns there, and this is what she said:

They change the interviews every year, but they usually have 4 rooms each with a different theme. Last years rooms were 1)Dr. Simon the chairman, 2)Dr. Peabody the program director and 2 residents talking about role models, 3)2 faculty and 1 resident talking about ethics, and 4)Dr. Manning the joints guy and 2 residents with some random ass hilarious question/scenario room.

Sounds like it hasn't changed since I interviewed there in 1993. What about the mystery bag? Describing shapes or determining how much money(coins) is in a bag just by feel.