The other one is they say they will pay XYZ into your account, say £50,000, you check your account and the £50,000 actually appears in your account, but mistakenly they have paid in £80,000, they then say whoops, our error can you sent the £30.000 back which you do as you can see it was £80,000 that was paid in, several days later when the transfer clears the bank finds the payment was bogus and removes the £80.000 from your account as it did not exist, but by then they have got your £30,000 and disappeared.
I feel for the guy but also think the bank should have picked up on such large amounts going out and stopped it.