We will describe the benefits and the challenges of using modern technology for designing and implementing in-class science demonstrations. We suggest that state-of-the-art instrumentation, such as a fast-speed video camera, can turn traditional lecture demonstrations from mere entertainment to an effective means for physics learning. We will showcase a Slow Motion Chamber, an experimental set-up that we have used as a demonstration tool in large introductory physics lectures. Finally, we will provide examples of experiments used in introductory physics courses, which greatly benefit from the analysis of a slow motion playback, and suggest how instructors can help students experience physics in action during lectures.