It was a fine sunny day in the forest. A rabbit sat outside his burrow, tippy-tapping on his typewriter. Along came a fox, out for a walk.
Fox: "What are you working on?"
Rabbit: "My thesis."
Fox: "Hmm. What's it about?"
Rabbit: "Oh, I'm writing about how rabbits eat foxes."
Fox: "That's ridiculous! Any fool knows rabbits don't eat foxes."
Rabbit: "Sure they do, and I can prove it. Come with me."
They both disappeared into the rabbit's burrow. After a few minutes, the rabbit returned alone to his typewriter and resumed typing.
Soon, a wolf came along and stopped to watch the hardworking rabbit.
Wolf: "What's that you're writing?"
Rabbit: "I'm doing a thesis on how rabbits eat wolves."
Wolf: "You don't expect to get such rubbish published, do you?"
Rabbit: "No problem. Do you want to see why?"
The rabbit and the wolf went into the burrow. Again, the rabbit returned by himself after a few minutes and went back to typing.
Inside the rabbit's burrow: In one corner, there was a pile of fox bones. In another corner, a pile of wolf bones. On the other side of the room, a huge lion was belching and picking his teeth.
It doesn't matter what you choose for a thesis subject.
It doesn't matter what you use for data.
What does matter is who you have for a thesis advisor.