user
Given a cartoon image and a caption. Caption: Can't wait to see the look on his face when we put these back on the tree. Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
Aliens are often portrayed as all-powerful beings who have technology far beyond human capacity. These aliens have the capacity to beam up leaves to their spaceship, and even to put them back onto the tree as if they never fell. While they have amazing technology, they still indulge in the low-class activity of pranks, which is surprising.