Commandment No. 5: Tips Are for Waiters

Editor's note: Jim Cramer's new book,

Real Money: Sane Investing in an Insane World

, is available in selected bookstores now. As a special bonus to

RealMoney

readers, we will be running Cramer's "Ten Commandments of Trading." For more about the new book and to order it, click here. To learn his "Twenty-Five Rules of Investing," click here. To read Cramer's first commandment, click here. To read Cramer's second commandment, click here. To read Cramer's third commandment, click here. To read Cramer's fourth commandment, click here. Today, we present Cramer's fifth commandment.

It's pithy and the interviewers love it, so whenever I'm asked about my new book,

Jim Cramer's Real Money

, the fifth of my Ten Commandments of Trading comes up:

Tips are for waiters.

"What does it mean, Jim?" they ask. Actually, it means that human nature and securities are a potent and devastating mix. People can whisper in your ear that

Nokia

(NOK) - Get Report

is going to buy

Research In Motion

(RIMM)

, and you believe, you genuinely believe, because you want the big score. You know that the best moves are takeovers and you are convinced that if you can catch one, it will make up for all the bum steers and bad bets you have made. Tips are winning lottery tickets in most people's eyes.

That's the reason I've had to default to a simple analogy, tips are for waiters, to remind myself how stupid tips really are. Does it occur to you, on hearing the tip, that if the person telling you that Nokia is going to buy RIM

really

knows that's going to happen, the person is an insider and is breaking the law, and you could get in trouble, too? Does it occur to you that if the person

isn't

an insider, he doesn't know? There simply is no way a tip like that can work. Leave it for the waiter.

It gets more sinister. Most rumors start for a reason: Someone's in a bad position. Instead of thinking, "Sure,

Cisco

(CSCO) - Get Report

is going to buy

Nortel

(NT)

," after you are given that particular tip, you should be thinking "Man, is this guy wearing a ton of Nortel and what won't he do to get rid of it."

I know that cynicism isn't a particularly positive attribute, but when it comes to tips, it sure is. Leave them for the waiter.

James J. Cramer is a director and co-founder of TheStreet.com. He contributes daily market commentary for TheStreet.com's sites and serves as an adviser to the company's CEO. Outside contributing columnists for TheStreet.com and RealMoney.com, including Cramer, may, from time to time, write about stocks in which they have a position. In such cases, appropriate disclosure is made. To see his personal portfolio and find out what trades Cramer will make before he makes them, sign up for Action Alerts PLUS by

clicking here. While he cannot provide personalized investment advice or recommendations, he invites you to send comments on his column to

jjcletters@thestreet.com. Listen to Cramer's RealMoney Radio show on your computer; just click

here. Watch Cramer on "Mad Money" at 6 p.m. ET weeknights on CNBC. Click

here to order Cramer's latest book, "Real Money: Sane Investing in an Insane World," click

here to get his second book, "You Got Screwed!" and click

here to order Cramer's autobiography, "Confessions of a Street Addict."