My coworkers surprised me with a birthday cake. A colleague who didn’t chip in took a huge chunk home for her kids like it was hers. After that, I started noticing she regularly dodged work, took credit for others’ efforts, faked participation in charity drives, and lied about working while partying.
When she was rumored for a promotion, I quietly documented her behavior and shared it with my manager, not to attack her but to give the real picture. She didn’t get the promotion, and later got reassigned after pulling similar stunts elsewhere. Karma worked — and I kept my integrity and my cake the next year.