user
Given a cartoon image and a caption. Caption: An optimist would see the room as half dry. Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
A play on the "glass half full/empty" thought experiment, which is used to identify optimists (who see a glass as half full) vs. pessimists (who see a glass as half empty). The wife who is on the dry side is telling her spouse to look on the bright side/be optimistic and stop complaining about the rain on his half. It's funny because her dismissiveness is partly driven by the fact that she's not experiencing the rain, so doesn't really understand where he's coming from.