Saudi Prince in Berlin

Saudi Prince goes to Germany to study.
A month later, he sends a letter to his dad saying:
"Berlin is wonderful, people are nice and I really like it here, but I'm a bit ashamed to arrive to school with my gold Mercedes when all my teachers travel by train."
Sometime later he gets a letter from his dadwith a ten million dollar check saying: "Stop embarrassing us! go and get yourself a train too!"