In an attempt to combat fake currency, black money and corruption, the Indian government banned 500 and 1000 rupee notes on November 8, 2016. There were several guidelines by the government regarding the scrapped currency and the newly issued one, asking people possessing old currency to deposit or exchange them at banks.
It took just a few seconds for these notes to be converted into worthless pieces of paper. But now, those possessing these worthless pieces of paper can become millionaires, especially those with special numbers such as 786.
So if you accidentally have a note left with you, it can be a golden chance to become rich! But your note needs to be special in some way since those with some special numbers like 1234, 420, 786, etc. are being sold at high value.