Responding to Prime Minister Narendra Modi's jibe, Congress vice-president Rahul Gandhi on Thursday asked him to disclose "what was there in those 10 packets of 2012-13"."Modiji, first disclose what was there in those 10 packets of 2012-2013," Gandhi said on Twitter, attaching a document, seized by the Income Tax department, of cash payments to Modi during his stint as Gujarat's Chief Minister in 2012-13.Gandhi on Wednesday accused Modi of taking kickbacks of Rs 65 crore from corporate houses as the Chief Minister of Gujarat and asked him to come clean on this.Modi on Thursday mocked him, asking where was the "earthquake" the Congress leader had threatened."There is a youth leader in the Congress who has just learnt to speak. I am glad that he (Gandhi) has started to speak now," Modi said sarcastically at an event in the Banaras Hindu University (BHU) in Varanasi.Modi has been elected to the Lok Sabha from Varanasi. "In 2009, it was very difficult to find out what was inside this packet. Good, he has started speaking. And there was no possibility of any earthquake.""Had he not spoken, the country would have faced a big earthquake. And the country could not have recovered for 10 years," Modi said.