There is something worse: a presentation scheduled for a 15 minute slot, and a statement of the type "slide 2 of 65" in the corner. You just know this is going to go WAY over time, and that the presenter hasn't thought properly about what his core message actually is. You also know most slides will contain a load of irrelevant information. I really would like an automatic tool that cuts down all presentations to a reasonable number (say one per minute tops), by randomly removing slides. Failing that, as session chair at such a conference, I would love to have a trapdoor installed, so the speaker can be removed from the stage unceremoniously when he overstays his welcome (or before, depending on my mood).