A metal slug dropped into a copper tube falls under the pull of gravity and drops out at the bottom fairly quickly. When a second, apparently identical, slug is dropped into the tube, it falls quite slowly. If one slug is secretly held in the instructor’s hand near the tube, the motion of the falling slug can be stopped altogether. In this activity, as the magnetic slug moves down the copper tube a series of transient “eddy currents” are induced in the copper tube, and these electrical currents create a magnetic field that opposes the downward fall of the magnetic slug. This activity could be used to teach teachers the importance of “wait time” or the “pause-to-ponder principle” after they have asked questions that require higher-order thinking skills and depth of understanding.