Karma is defined as "the sum of a person's actions in this and previous states of existence, viewed as deciding their fate in future existences." in Buddhism and Hinduism and is a really great rule to live by regardless of your religion, a simple theory that what you do comes back to you.
For some people it literally comes back at them.
Here's a quick compilation of eight gifs to give you a laugh and remind you that you should always think a situation through before acting on your thoughts.
Do you have any instant revenge gifs you'd like to share? Put them in the comments!