This slide-show originated at a one-day teaching workshop in January 2011. The event, organised by the Physiological Society was held at the University of Leeds. The slides describe an activity used with undergraduate students at the University of Leicester, in which a short video "the smell of fear" from the popular (and populist) science programme Brainiac is used to introduce the notion of experimental design. This is used hand-in-hand with discussion of a formal scientific paper on the same topic. This set of slides is to talk about the activity. There is a second set with a similar title http://www.slideshare.net/cjrw2/experimental-design-the-smell-of-fear which are intended for use by anyone actually using the activity to teach experimental design. The colour of the background to the slides in the current presentation is significant - the purple slides are ABOUT the activity, the black slides are examples of pages from within the activity.