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Ooh, there's another fun one...
"Indicated" airspeed isn't actually how fast you are going relative to the air. "Indicated" airspeed is how hard the air is pushing into the front of the pitot tube. But, at high altitude, the air is thinner, and doesn't push as hard. To get the same indicated airspeed at altitude, you have to be flying much, much faster.
Indicated airspeed is how fast the wings "think" they are moving. If the stall speed is 80kts, and the true airspeed is 200kts, but you're so high that the wings "think" they are only moving at 75kts, the aircraft is in a stall.
Next up, "critical mach number" and "coffin corner"