Which red flags make you stop analysing a stock entirely?

I’m interested in how other long term value investors think about elimination rather than selection. When you start analysing a company, what are the 2 or 3 fundamentals that immediately make you stop digging further, regardless of how compelling the story or valuation might look? Not looking for specific thresholds or “magic numbers” I am more curious about the underlying reasoning and how you apply it across different sectors and business models.