I did just about a week ago, actually, and they've been running amok on my campus over the last little while.
Actually, I got off very easily. I talked to the guy for a few minutes, and I think I managed to subtly intimidate him off me - by being nice and yet keeping "high ground" and throwing out a few effective countermeasures
I told him I'm a quaker (not quite true) and grew up in the family of a full-qualified protestant pastor (entirely true). Looks like a direct but well-directed evasion worked on him.
My dad, who has actually become increasingly atheistic over the years had taken a more extreme approach a few months ago when instead of crossing fingers when they showed up in the neighbourhood - he actually got out of the house, went right after them, and made minced meat of them (intellectually speaking). They've been so traumatized, I think, that they don't even come to our area anymore :rotfl: