People don't get my humour. Should they?

So, I was walking through Chapters with a friend when I glimpsed this book cover:

I pointed it out to my friend and remarked, "Gaslight Dogs! I bet the dog is after missing jewels so he rearranges all her furniture to make her think she's going insane!"

My friend was puzzled.

"Like in Gaslight." I explained.

The conversation abruptly concluded.