It's an incident referred to at the start of The Empire Strikes Back but sadly one never seen onscreen- as an angry Threepio berates his comrade Artoo for an earlier 'accident' in the Hoth hidden Rebel base - the thermal heater melting of ice within Princess Leia's quarters and the subsequent water damage done to her clothing. A fine moment for humour linked to the classic duo and Leia thankfully brought to life by that excellent artist Chris Trevas a few years back.