I like the last panel, it's a long set up for a lame joke!
Inspiration - http://annsofun.stripgenerator.com/2007/08/27/theory-vs-reality.html
1. Theory - chase - eat
2. Reality - Dogs chase their tail.
3. Cats eat the other pets.
4. Mice do the same thing they do every night, try to take over the world!