The son of a rich Saudi sheikh arrives in Germany for his University studies.

He soon writes home to his father.

Dear Dad,

Berlin is wonderful, the people are nice and I really like it here,

but Dad I am a little ashamed to be riding to class every day in my 24k gold Ferrari 599GTB

when my professors, friends and many fellow students all travel by train.

Your son, Ahmed

Promptly, his father writes back.

My Dear son Ahmed,

$20 Million has just been transferred to your account.

Please stop embarrassing our family.

Go and get yourself a train too.

Love, your dad