Some time ago, I was taking a ground school class for private pilots.
During the sessions on weather, the instructor wanted to discuss the concept
of sublimation – the act of going from a gas to a solid skipping the
intermediate stage(s). e.g., frost – water vapor in the air becoming a
solid on surfaces without first going through the liquid stage.

Wanting to see if the class had understood the concept, the instructor asked
if anyone could provide an example of something that went straight from a
solid to a gas (expecting dry ice as the answer), a previously unknown
section of my mind took control of my mouth and immediately emitted the word

It took the instructor about 10 minutes to regain an academic composure.

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