Roy Muturi B's Key Ideas from Influence, New and Expanded
by Robert B. Cialdini

Imagine this, you are walking about in a busy market area, you desperately need onions and other staples to prepare this bomb meal you want to surprise the whole family with. I approach you or rather another chapped looking fellow approaches you and says, "May I interest you with a bundle of carrots for only $71" Your jaw drops wide and politely decline but then he offer you a deal on shallots with 10 dollars a bundle. You walk home bewildered. With no money in your wallet, but with a bundle of shallots. Surprising isn't it?

Robert B. Cialdini argues that, simply put, that asking someone a big favor will instill a sort of psychological pressure that otherwise compels the other person to perform the second task.

I decided to try it on my classmate Kylie. I really needed an eraser but she was known of being quite selfish with her stuff, so I asked, "May I borrow your question paper?" She looked at me passively and continued working on her exam. Then I asked, "May I borrow your pen?". "Don't you have eyes to see that I am using it?" She snapped. "Fine then, may I borrow your rubber," I finally asked.