Cheers - Season 11 Episode 9

Cliff is convinced that his new neighbor is Adolf Hitler. If not for Ma standing up for him, Cliff would be evicted from the building for harassment. But Cliff's still not convinced as to his neighbor's true identity. Meanwhile, Carla and John Allen Hill continue their love-hate relationship. However it has gone to a new level, to a love-hate-heart attack stage. Hill had a heart attack while they were making love. Seemingly indifferent to the heart attack since Hill is just a romp in the hay, Carla eventually breaks down in tears since "her boyfriend" had a heart attack. She suspects that the reason he did have a heart attack is she spurted out the words "I love you" to Hill. She doesn't know what to do since their relationship is built on hate. She finally goes to see him in the hospital, and based on events and the fact that Hill is out of commission for eight weeks, they decide to try and move their relationship to the next phase of true boyfriend-girlfriend. This eight weeks, or perhaps a shorter time period, will test if they are destined to be truly boyfriend-girlfriend.