Camping

An illiterate father with his educated son went on a camping trip, they set up their tent and feel asleep.
Some hour later, father wakes his son and asks:
- "Look up to the sky and tell me what do you see?
- Son: I see Millions of stars...
- Father: What does that tell you?
- Son: Astronomically it tells there are millions of galaxies and planets up there...
- Father: Slaps the son hard and says, "Idiot, someone has stolen our tent!"