Idiot, someone has stolen our tent

An uneducated father with his educated son went on a camping trip. They set up their tent and fell asleep. Some hours later, the father woke up his son. 

Father: Look up to the sky and tell me what you see. 

Son: I see millions of stars... 

Father: And what does that tell you? 

Son: Astronomically, it tells me that, there are millions of galaxies and planets out there! 

Father slaps the son hard on his hand and says, "Idiot, someone has stolen our tent!"