The occasion was the joint sitting of both Lok Sabha and Rajya Sabha, addressed by President Pranab Mukherjee, that saw political rivals from Left, Right and Centre exchanging pleasantries.
The exchange of greetings between Modi and the Congress Vice-President caught the attention of everybody. The Prime Minister was seen warmly grabbing Rahul's hand.
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Modi greeted the Congress Vice-President who was seated in the eighth row along with senior Congress leaders Motilal Vora and Jairam Ramesh.
As soon as Modi, dressed in his usual half kurta and jacket, came close to Rahul, he held his hand bringing an instant smile on the Congress leader's face.
Soon leaders of various parties surrounded Rahul.
This is perhaps the first occasion when Modi exchanged greetings with Rahul after a bitterly fought Lok Sabha election.
Modi, as the Prime Ministerial candidate of BJP, had frequently attacked Rahul mocking him as "shehzada" and targeting the Gandhi family during campaigning.
Before the President's address began, Sonia was seen engaged in prolonged chat with Advani sitting next to her in the packed Central Hall.
A number of MPs, including Chandan Mitra, Babul Supriyo, Rajyavarhan Rathore and Manoj Tewari, who could not find a seat, kept standing during the President's 55-minute address.