A train

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 Mercedes when all my teachers travel by train."

Sometime later he gets a letter from his dad with a ten million dollar check saying:

"Stop embarrassing us!
go and get yourself a train too!"