The phrase "punch line" refers to the funny or clever part of a joke or a humorous statement that comes at the end. It is the part that makes people laugh or causes a surprise and is often the most memorable part of a joke. Full definition
The comedic punch line of the struggling lost dad is the one through plot that is fully realized throughout the film. (seligfilmnews.com)
Here's death to prevent death, death as punch line and dance sequence, death without consequence even as the script insists nothing could matter more. (villagevoice.com)
Perhaps my favorite punch line comes once you figure out how to kill the zombie sheep. (clearancebinreview.com)