Pygg is a new banking/money startup in Sydney - and they're looking for new users! To promote the service, they're giving away $10 free. The only catch is a $2.50 transaction fee - and that you deposit $20.
So, deposit $20 + $2.50 fee = $22.50 cost, get $10 free. Total amount in Pygg = $30. Withdraw, $7.50 profit!