Mbh 7.180.1

“Sanjaya said, ‘Beholding Hidimva’s son slain and lying like a riven mountain, all the Pandavas became filled with grief and began to shed copious tears. Only Vasudeva filled with transports of delight, began to utter leonine shouts, grieving the Pandavas. Indeed, uttering loud shouts he embraced Arjuna. Tying the steeds and uttering loud roars, he began to dance in a transport of joy, like a tree shaken by a tempest. Then embracing Arjuna once more, and repeatedly slapping his own armpits, Achyuta endued with great intelligence once more began to shout, standing on the terrace of the car. Beholding those tokens of delight that Kesava manifested, Dhananjaya, O king, with heart in grief, addressed him, saying, “O slayer of Madhu, thou showest great joy at a time scarcely fit for it, indeed on an occasion for sorrow caused by the death of Hidimva’s son. Our troops are flying away, beholding Ghatotkacha slain. We also are filled with anxiety in consequence of the fall of Hidimva’s son. O Janardana, the cause must be very grave when at such a time thou feelest such joy. Therefore, O foremost of truthful men, asked by me, tell me truly (what that cause is). Indeed, if it be not a secret, it behoveth thee, O chastiser of foes, to say it unto me. O slayer of Madhu, tell me what has removed thy gravity today. This act of thine, O Janardana, this lightness of heart, seems to me like the drying up of the ocean or the locomotion of Meru.”’