For those of you interviewing soon, check the OSU interview feedback page and prepare for as many questions on there as you can. The 5 drugs question isnt a joke, I got it. You will be able to see who is interviewing you beforehand so if you see Pharmacology or PhD next to one of your interviewer's name, there's a little hint right there. I was also asked name a disease caused by a bacteria, virus, and fungus. Other than that the only other unexpected question I heard of was "teach me something" and was asked to go to the whiteboard in the room. I interviewed in the last group of the day and all the M1 and M2 students came in and told us what to expect beforehand so I wouldn't be worried at all. Everyone there wants everyone to succeed, it is an awesome environment.
Other than those questions, everything is very very laid back and it felt like the interviewers were talking to each other more than me at times. Relax, be yourself, and enjoy getting to know your interviewers. I think this interview was the best one I've had to date so don't stress over it!