The only run in I've had with door-to-door Mormons was while I was living in an off campus house in
Lynchburg, Virginia. It was winter and the snow on our front lawn was more ice than anything, in the stages of melting. I walked out on the
front porch and saw a Mormon pair of boys setting out on my
next door neighbor's steps.
Knowing they were likely coming to my house next, I broke out a can of black spray paint and decorated the snow patches with grafitti: anarchy symbols, SATAN LIVES HERE, among others. I was heading out the door anyway, so I hopped into my car.
As I was backing out of the driveway on the far side of my house, there they were on my front lawn. The house was now empty and they were actually smiling at the stuff I'd painted for their benefit.
Good to know they have a sense of humor.