Ugh. We sometimes got crazy preachers at one of my old colleges. To the point that the students were told to just ignore them, don't make eye-contact, and DO NOT speak to them at all.
Thankfully, the Uni I graduated from had *gasp* reasonable, polite people. All they'd do is hand out copies of the NT and provide an opportunity to talk, but didn't force it on anyone. Well, except for the one time the WBC protested us for... something. No one was ever quite sure what.