1975 RDA (MacGyver) Poster
MacGyver plugs a sulfuric acid leak with chocolate. He states that chocolate contains lactose and sucrose (chemically C12H22O11), which are disaccharides. The acid reacts with the sugars to form elemental carbon and a thick gummy residue (proved to be correct on Mythbusters).
-MacGyver Pilot episode (29 September 1985)Source: newlyswissed.com