Everyone -- from a common man to an oil pundit, was surprised when oil prices went into negative territory on April 20. Some motorists believed that petrol will get cheaper and they will be able to buy it for Rs. 33.68 per liter -- since one only has to pay for the excise duty, dealer commission and VAT. Some may have even thought that they will be paid money for buying petrol, since the US benchmark West Texas Intermediate (WTI) fell to an unimaginable low of minus $37.43.