I once had an instant karma experience when I was raising fund for a charity with a group of my college friends. We were required to do so for one of the subjects of our course, "introduction to business".

Our main strategy for the charity drive was reselling fruits that we bought in a big stock. Of how inexperienced we were, we overlooked many aspects of running a small "business", including taking care of the product quality. (We are technically not business students, it was like a minor subject of our major.)

So as we were selling the fruits, I noticed there was one apple, some part of it was rotten. However, I did not care less whether the apple was rotten or not. All I wanted was our products to be sold as much and as quick as possible and reach our "selling target" for our assignment.

Then BOOM! Karma came like a guru and taught me a lesson. There was one good guy came across us, seeing us work so hard for our school assignment charity drive. He bought a few fruits from us as a sign of his support.

I knew the existence of that rotten apple and I still gave him that one regardlessly. Seconds later after that guy purchased that apple, I instantly tripped by a small drain beside me and hit the road HARD.

WOW. Inside my heart, I knew what's happening. My friends around me without any knowledge of it, came to assist me standing up and help me with my wounds on my ankles.

After that experience, never dare to step too much further from the grey zone. Stealing that extra benefits from my friends? Nah. I don't need this slight, tiny little benefit that I think will make me feel better as far as I know somehow, there is a certain cycle that keeps the world working. When you do bad, you wouldn't necessarily get the instant fruit of it, but it somehow will be inflicted to you in another form. Same for vice versa if you do good. I think it is just the reflection of your behavior and your thoughts. Everything in accordance with nature.