This happened to me recently. A user named Zai21 on LuckyFish casino messaged me saying "hi". I responded with "sup", and he said:

"ok listen im from China and i have money on one site but i cant withdraw it because my region ban let me send you this money and you withdraw it and send me you can keep 0.1 btc for help"

I suspected an obvious scam, but I generally like to try to appear to be an easy target and follow through with scam attempts, if only to gain additional information about what methods scammers use to deceive unsuspecting victims. I would post screenshots of the exchange, but my account status is still Newbie so I'll just copy/paste and summarize.

I told them I'd be happy to help them out, and they asked if I had Telegram. I said yes, and they said:

"register on the exchange expocoin.net i send you btc on site then you get them from the exchange to your wallet and send me my soul mate"

*eyeroll*.. I did create an account on the site (not realizing at the time it was a totally fraudulent exchange platform), and proceeded with the charade of him (Telegram username was Chuiia) sending me 1.2 btc on the site and then giving me an address to withdraw 1.1 (allowing me to keep 0.1). Then there was an error message when I tried to withdraw to the wallet specified saying that the site required a deposit from their users of at least 0.02 btc before they could withdraw (didn't make much sense; something about in an effort to reduce bots or something). I told the guy on Tele and he seemed super nervous and frustrated and said if I made the deposit he'd let me keep 0.15 btc instead.

At this point I started looking at the site a bit more closely and found that although it looked somewhat believable, any of the links to go to the actual exchange were just dead, and the only seemingly functional part of it was a roulette-style game similar to the one on CoinOpen (dot io). I tried playing two different rounds using some of the "btc" that the user had transferred, and I won both rounds. The user was getting all aggro toward me on Tele saying things like "send me my btc now" and stuff, threatening to contact support to have me banned, I guess trying to convince me that it was legitimate coin that he desperately wanted back.

I eventually took a glance at the site's HTML/CSS data and quickly found that the entire looping contents of the fake chat frame. I sent him a screenshot of that and asked why he was still trying to convince me of anything and a minute or so later my IP had been blacklisted.

Overall, pretty clever little scam and I bet they manage to dupe quite a few less experienced people.