Question for an aggressive humor : You can't unload a truckload of bowling balls with a pitchfork
Solution 1:
The need to laugh at things which are tragic, offensive or disgusting is known as "gallows humour" or "black comedy".
- https://en.wikipedia.org/wiki/Black_comedy#Nature_and_functions
The form of the joke is "the difference is a surprising similarity".
Example:
- What is the difference between a violinist and a dog?
- The dog knows when to stop scratching.
Or:
- What is the difference between a violin and a viola?
- The viola burns longer.