This walkabout recreates Jean Perrins playful science prank in which he added a running aviation gyroscope to the inside of a suitcase and then checked it into a Paris railroad station. A porter picked it up and began carrying it through the station. When he tried to turn a corner, the suitcase turned to an unexpected angle. Shouting "The Devil himself must be inside!"; he dropped the suitcase and ran away.
The science of the briefcase is explained using spinning hats, basketballs, diabolos and power tools.