user
Given a cartoon image and a caption. Caption: I can keep it together during the ceremony. The reception is where I fall to pieces. Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
A play on "keep it together" and "fall to pieces" --- people at weddings will often get wrapped up in the emotion of the event, and end up crying: that is, they figuratively don't "keep it together" and do "fall to pieces." However, both these take on a literal crumbling interpretation for a wedding cake: it's easy to keep it together for a cake during the ceremony because no one is eating cake yet. But, during the reception when people eat the cake, the cake literally is cut into different pieces to serve.