I saw proof one day. I was visiting a welding shop on business, never been there before, didn't know them. At some point, I'm sitting in the office with about five guys, distracting them from their work, yakking, and I mention a big piece of gear I have to haul around using a cart. One suggests a different kind of cart, and describes it. As we're talking, one of the other guys gasps, and holds his phone up to show the boss.
While we were talking, this guy opened his phone, and the first ad that popped up was for that odd, obscure equipment cart that we had just been talking about.
It turned out that these guys had been discussing this subject earlier, and now it was confirmed for all of us.
