An illiterate father and his educated son went on a camping trip. They set up their tent and fell asleep.

Some hours later the father wakes his son and asks

"Look up at the sky and tell me what you see"

Son: I see plenty of stars

Father: what does that tell you?

Son: astronomically, it tells me there are millions of galaxies and planets

Father slaps the son and says idiot someone has stolen our tent.

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I'm really sorry if you found the last joke quite offensive.