I'm not a prof, but I have a PhD and I have done temporary/short term work in/for/with universities where I've lectured and/or given seminars or general assistance in my field.
I have to say I agree with Jennifer. I'd roam around looking for people to chat to and be delighted when people stopped me in the corridor or whatever, and would invite them for a pint at lunch time in the pub. I'd often be found there with a few of other teachers/students that I gathered together to chat and theorize together.
The INTP's (there were two at the college in question) spent most of their non-class time in their offices, hoping not to be disturbed.