Oh man...I remember parking lot witnessing. This became a big fad in the mid 90s. It was sold to us that since no one was home on Saturday's anymore, we'll go where the people are...the shopping centers and malls.
I remember sitting in cars watching as people came and went and planning our attack with SWAT team precision. We would watch for the slow and weak of the herd, usually older ones who couldn't move very fast.
Then we got word that the shopping center owners weren't happy with us as we stopped people from coming into their stores, so a new directive was handed down...approach people as they were leaving the stores only, or those sitting in cars waiting on someone.
I lost count of how many people I startled when I walked up to their car window when they weren't expecting anyone.
Then some of the shopping centers started posting signs, "no soliciting", "no trespassing", "no loitering", "no canvassing", etc. When the signs went up, I stopped doing parking lot work. I hated it anyway. I felt like I was bothering people. I know how I feel when kids try to sell me candy bars or doughnuts whenever I leave a store. How much more irritating is it to be bothered by someone trying to proselitize to you?