Just wanted to note that I invented this pun in the 1960s when I was in high school. Since then it has been plagiarized multiple times by others. Another version is: If Lassie were depressed would she be melancholy?
“My melancholy is the most faithful mistress I have known; what wonder then that I love her in return.”
- Soren Kierkegaard, Either/Or: A Fragment of Life