New Delhi, December 24: Just as banks were witnessing signs of recovery from the crisis of non-performing assets, the Karvy scam has opened another can of worms. The company that caters to investment needs of lakhs of people got mired in controversy for transferring its customers’ securities to another account and then pledging that account to raise money from banks to fund its own businesses. How this unfolds and gets resolved is yet to be seen but it brings back memories of some other scams which have shaken the confidence of people, especially investors, in the system. Here is a look at five scams that India witnessed over the last two decades: