Jayant Aggarwal is unlikely to forget his encounter with senior Congress leader Digvijaya Singh. "He got down from his vehicle, walked towards us and then he slapped me", claims Mr Aggarwal, who lives in Ujjain in Madhya Pradesh. Mr Aggarwal was among the BJP activists who heckled Digvijaya Singh when the Congress leader visited Ujjain over the weekend. Mr Singh said that he does not rule out the possibility of the BJP's parent body, the Rashtriya Swayamsewak Sangh (RSS) being involved in last week's serial blasts in Mumbai.