I actually had 2 really odd questions from Dr. Miloro when I interviewed at nebraska.
1. Why are manhole covers round?
(so the cover can't fall into the hole)
2. How do they measure boeing 747's after all the passengers have boarded to make sure its not too heavy to take off.
(apparently someone told me they have scales built into the landing gear, otherwise i'm still stumped)
The residents told me he had gotten a book of questions the microsoft people ask their engineers when they interview them and was goofing around.
Otherwise dude, they usually ask lame stuff like why do you like OMFS, what do you want to do after your OMFS certificate if you match, are you interested in teaching, what kind of research have you done, .....etc.
Its really boring stuff.