This document outlines the top 10 presentation fails from the perspective of a client or prospect. Some of the biggest fails include using confidential slides from another client without permission, showing screenshots instead of demonstrating the product, making claims about features that don't exist yet, reading the slides instead of engaging the audience, looking at the slides instead of the customer, having an inconsistent theme, misspelling words, having a boring "flat" presentation, and forgetting to turn off email or instant messages during the presentation. The author emphasizes that presenters should prepare extensively and avoid these mistakes in order to make a successful impression and not lose the prospect to another vendor.