A stranger agrees to my price over the phone and shows up a couple of hours later. After quickly inspecting the game and playing one ball, he begins breaking the game down for transport. I ask for payment and he hands me a nice thick envelope from his back pocket and he verbally repeats our agreed upon price to me.
I open the envelope as he continue to pack the game, and I begin counting out a shit ton of $5's, $10's and $20's. I said, Hey guys, we've got a problem here. This envelope is way short.
The guy buying the machine tells me he gave me the wrong envelope and goes out to his car. He comes back and hands me a second envelope, and this one is stuffed with hundreds. And between the two, it equaled our agreed upon price.
My friend that witnessed all of this says, Wow, good thing you counted it, I usually just stuff the envelope in my pocket. The buyer in response says, Yeah, I'm always good for it though.
So the guy finishes packing and removing the game in one of the quickest turnarounds I've ever had. No geek out conversations about our hobby or Pinside, nothing and poof, he was gone.
After he left, I turned to my friend and I told him I'd never deal with that guy again, as I believed the envelope story was an intentional con. My friend was a bit perplexed as he saw it as an innocent mistake. I later convinced him otherwise.
This is why I always count the cash and count it with them standing right there. It was also a good reminder of my conceal carry weapon.