The Lost World: Jurassic Park, with the supposed biologist Sarah Harding being one of the worst. She goes alone on an island filled with dinosaurs, and complains that Ian doesn't need to rescue her, then stumbles from one moment of rampaging stupidity to the next like a female Mr. Bean. To make matters worse, she lectures everyone with her about what you should or shouldn't do in a situation before immediately going out and doing what she said NOT to do. And unfortunately, this is a situation where her being Too Dumb to Live results in not her death, but the deaths of nearly EVERYONE she encounters on the island.
Burke: No, no. You're wrong there, Dr. Harding. We'll lose them once we leave their territory.
Sarah: No, don't bet on it. Tyrannosaurs have the largest proportional olfactory cavity of any creature in the fossil record with the exception of one.
- So naturally, she continues to wear a vest covered in the blood of the aforementioned tyrannosaurs' infant. It's not like she forgot that it was there—Roland pointed the blood out to her and she explained that it was the t-rex infant's, and didn't think that there might be some danger in carrying it around.