While Ranbir Kapoor is known to be an intense actor, his friends recently got to experience his fun side too. The actor played a prank on the sets of his upcoming film on his co-stars Kalki Koechlin and Aditya Roy Kapoor. While shooting for one of the scenes in Yeh Jaawani Hai Deewani, RK replaced the water in a couple of shot glasses with real vodka.