Don’t feel too bad. My joke at post 20 failed miserably.
Once, while taking a college course in astronomy, I asked the teacher “Does Uranus emit gases”? Uranus IS after all one of the 4 gaseous planets: Jupiter, Saturn, Uranus and Neptune. The teacher laughed, but I don’t think any of my classmates did. I doubt they got the joke. At least half of them were foreigners.