user
Given a cartoon image and a caption. Caption: That's a rare medium. Well done. Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
A play on the terms "rare", "medium", and "well done"; these three phrases are steak temperatures that people prefer, which ties in the the barbecue. But on the other hand, in the art context, a "rare medium" would be a piece of art that is constructed with uncommon materials; the uncommon material is the burgers he's cooking. The "well done" is re-framed as a congratulatory message for barbecuing well.