eat or be eaten
If you don't eat, you get eaten. It's like the jungle of life where people are always looking to chew you up and spit you out if you don't keep up.
My coworker took my idea and presented it as his own. Now he's the star and I'm the background noise.
I missed the deadline. Now I'm the only one working while everyone else goes on vacation.
I didn't show up to the meeting. Now I have to make up for it and no one even noticed I was gone.