This incident happened on the sets of Khawish, Mallika Sherawat's flick. We all remember the bikini scene in which she and Himanshu get more than a little cosy.
During the shooting of that famous scene, Himanshu decided to play a practical prank on her. As they stood under the waterfall, he yanked off her bikini bottoms and exposed her buttocks and pussy for all to see. And what a trmendous sight it was! But that plan backfired on him.
You see, Mallika is a woman pround of her 36 C breasts and amazing bod. She did not bother to cover herself up but yanked off Himanshu's trunks, exposing for all his erect penis, which though fully erect was not more than five inches in size. Himanshu had not bargained for letting this secret of his out in the open. He felt embarassed and tried to cover up his genitals but Mallika stopped him.