I had the privilege to attend an exclusive presentation course delivered by the Bob McDowell (Microsoft) many moons ago, and some of his advice to deliver great presentations still resonate in my ears. He hated Powerpoint. He loved the "b" button during powerpoints, and he really made me change the way I deliver presentations for good. Listen to the audience first. Craft a good story. let the slide *compliment* your talk, not distract from or duplicate.
Recently, I shared some of these secrets and learnings with Martin Manser, and he published a good short, sharp book on the topic. And when I saw this 4 minute comedy on poor powerpointing, I thought it's worth sharing it!