Some may not appreciate the humour in this story, but here goes. Back in the early sixties I was working at a military base repairing and overhauling military electronics equipment and completing trials. During that period there was a very gradual transition in the military from WWII electronic equipment that used vacuum tubes to the newer transistors. A new piece of test equipment appeared on the base manufactured by Tektronix called "Transistor Characteristic Curve Analyzer", kinda like a sophisticated old time tube tester. We got one. Sometimes it gives a person satisfaction to play a prank on someone who is somewhat extremely arrogant. One young technician sorta took ownership of this new piece of equipment and was the resident expert of the new technology.
After several months of watching him impress others with his expertise on analyzing transistors, I removed the metal cap from a 3AG fuse and filled the cap with solder and with three tinned copper wires protruding, spaced appropriately, I gave it to him and asked if he could analyze this unknown transistor. He looked at it carefully, didn't recognize the IA 3Ag designation on the metal cap and connected it to the analyzer and proceeded to check it, fiddling with the knobs on the instrument until he finally admitted defeat...Maybe it was a mean prank- a humbling experience for him,but harmless.... Needless to say, we have all had humbling experiences.