Save and invest when all your friends are spending every dollar they have.
Nice Ferrari!! I am a little envious, but then I remember that you have worked your ass off for it, and it is a testament to how hard work and being wise with your money pays off in the end.
I try to get my friends to understand this simple concept. Every time one of them gives a hard time about how good I have it, I remind them that they are putting all their money into car payments and credit card payments.