Mid/late-90s, a woman who was having an affair with one of the managers gets a huge promotion despite not even being qualified for the job she had. No question as to why. Proceeds to embarrass herself at every turn, yet manager thinks she's great. Meanwhile, truly deserving people are overlooked.

Mid-2000, same woman is now in charge of a new product team. I'm working as a technical consultant and evaluating products for purchase by GSA (Government Services Administration, the buying arm of the US Federal government). Her product is on the GSA-approved list but has never been evaluated for compliance. Lying to the Feds subjects you to the False Claims Act and can result in fines and being blocked by GSA from selling to the government. I alert company management to this. Not only is it a danger to the company, she had to have lied about it to launch the product in the first place. Lawyers get involved. I hurriedly evaluate the product. Luckily, it qualifies. We cross our fingers no one from GSA ever asks to see the paper trail.

A month later she's leaving the company to start her own catering business (I'm not making this up).

It didn't last a year.