I have a few memorable ones.
Working with my friend - both teenagers at the time - knocked on the door in the middle of the day. Takes a while for the householder to come to the door. A man comes to the door wearing nothing but a towel. My friend begins her presentation and the man lets go of his towel. My friend turns a very bright shade of red and we leave laughing.
Working with my dad one day we knock and out comes a very angry woman "get off my property before I get my gun. I wouldn't piss on you if you were on fire!" she yells. My dad smiles at her and says "okay, have a nice day."
I also had a "magazine route" when I was young. We were encouraged to offer subscriptions so I offered her one on my next visit. She says to me "oh no love, I was only taking the magazines because I think you are cute."