The finale of the weekly physics department seminar series at my college is my annual demonstration lecture. Normally, the front of the room is filled with apparatus, but in May 2008 I had only a giant kaleidoscope and a leaning tower of Pisa (Fig. 1) on display. Instead, there was a pile of overhead projector transparencies that showed examples of phenomena and devices that I had seen in my travels. They were largely examples of large-scale, real-world physics that I thought would be useful in starting class discussions. Here are some of them.