user
Given a cartoon image and a caption. Caption: Well, after you beheaded the groundskeeper, we had to go with something low-maintenance. Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
The king doesn't like the cacti decorating his throne room, but cacti are low-maintenance plants that don't require a lot of water, and grow easily. They had to switch to low-maintenance plants because he had the groundskeeper killed so there wasn't anyone to take care of the plants, but it seems like he regrets this decision.