5) Speak Up Early, Stand Your Ground
You're working with a senior colleague to analyze client sales growth in different regions to present to your manager. Your colleague is also working on another module, so you're doing most of the work on this one while he supervises. Your performance on this will - in a very real way - determine your final performance evaluation results.
Your expected deliverable is a slide summary of trends over time split by region. You've spent time looking at the raw data, and now it's time to produce the slide. Your net data looks OK, but you see some large outliers in data points here and there which throw everything off. In spite of that, your senior colleague hasn't said anything about them.