One day two school mates met after a very long time. The first man who was eating at a Hotel identified the Waiter as one of his good old friends.
"Hello Mcahan, I am very happy to see you. But you should be ashamed to work here as a Waiter. Isn't it "
Waiter said "Why should I be... you should be ashamed."
"Funny thing ... you know ... I am an Engineer now."
"That is why ... Because I do not eat food from this Hotel, but you do"