"I was airing some stuff out! What was happening to me as Sandra sort of coincided with what was needed in the scene, so I just aired it out! I'm very modest in real life, but for some reason, that day I kept whipping those pants off and I forgot everyone was on the bus... and they were looking at this mess all day long!" Sandra Bullock was stunned by her own fearlessness on the set of Our Brand Is Crisis after mooning her co-stars during a shoot in Puerto Rico.