I have listed my bike on sale on Polish site (so expected audience are Poles only). One guy contacted me that he wants to buy bike and I should send it to Nigeria. At this point, I have instantly thought that this is scam. However, one thing is disturbing me: he offered to pay with bank transfer (I expected scam to offer payment with PayPal or Western Union). Happens, that I have prepaid card, so I wanted to give him bank account of this card, then take money (so at this point I believe I am unable to lose anything, right?) and then send bike. When I was talking with friends, they suggested, that if this money will happen to be stolen or something, then bank may want it back from me. One of my friends suggested, that I should get BitCoin trader as middleman for safety. So provide Nigerian guy with BitCoin trader's bank account number.
If Nigerian guy is honest and everything will be okay, then he will send money to BitCoin trader, and this one will send BitCoins to me, I will send bike to Nigeria and everyone is happy.
However, if later money will happen to be stolen or something, then looks like, it won't be my problem, is that correct? I have shipped bike, so it cannot be retrieved, however same goes with BitCoins I have received.