I think Jim is referring to the 'chain' unit of measurement...
So yesterday we managed to avoid getting scammed...we had put our little camper on GumTree for sale, within 10 minutes had two contacts saying they wanted it, full price, give then our name address and bank/paypal details...they can't come and see it, they can't call because wow, so coincidentally, they have very busy high powered jobs and can't get away...will send an agent to pick it up after the money gets to our account...wanted as a surprise gift for 'cousin' 'family'...neither would enter into or refer to discussion about optional extras...no, want it now, full price, bank transfer...
My spidey sense started tingling, especially when one that has sms messaged me blocked a return sms...
I almost fell for it, but thank goodness had the presence of mind to pause and say, hey wait a minute...as well as the old adage when you are buying/selling your stuff to insist on face to face or direct contact of some description.
Both attempts got me to switch to email, didn't want to use the website message system, the language was off, grammar, flow, and when both of them used the same tactics, and the pressure started coming that they really wanted it and the money would be transferred immediately as soon as they got our details...yeah NO!
They try to get your email, address, name, and then either bank details or paypal/bank stuff...I dodged a bullet, reported the whole thing and their email addresses (gmail so no bets that those accounts are gone now) and GumTree confirmed it is a scam. Bastids
Happy ending though, we sold it a few hrs later to someone down the street! Cash.