22. Mary Kay and Johnny Stearns on Mary Kay and Johnny
Mary Kay and Johnny began broadcasting in 1947, and is widely considered to be the first sitcom. It also holds the distinction of being the first television show to depict a couple sharing a bed. This is a fairly big deal considering the bedrooms of famous TV couples for years afterward—the Ricardos on I Love Lucy (1951-57), the Cleavers on Leave it to Beaver (1957-63)—slept in twin beds.