Here is a short list of scams that has been floating around for quite a while:
1 Nigerian scam - they call you, tell you that you can get 200k if you pay them 12k to help them in paying some govt tax to get 3million out of Nigeria. After you pay 12k, there is still 25k to pay some admin fee. After that, another 28k for some agency fee and so forth...... And the 200k vanished in thin air.
2 China lottery scam - they say you touch some 2million lottery. Similar to above, got to pay this, pay that and so forth.
3 Van with some extra cheap electronic goods. Samsung 46inch LCD for a mere 200bucks..... too good to be true.
4 Magic stone scam - they prey on some old aunties in the wet market.
I am sure folks here have heard of other kinds of scams around.