You feel you've gotten all you can out of your full time job and you think a change of scenery would do you some good. You begin looking for opportunities online, keeping an eye on Monster.ca, Craigslist and any other job board you can think of.
You aren't in a real hurry to find a job, so you can hold out for something really great. One day, you're surfing one of these sites and you see an ad that catches your eye. It's a company telling you it will do the monitoring for you and let you know if there's a job that fits your profile.
You provide them with all the necessary information and for a fee of $20 a month, they monitor every major job bank and keep you posted on the best ones in your field. It'll buy you an extra ten or fifteen minutes a night of television time. And that would be great--if they were actually looking out for you. Instead, they're collecting your $20 for no work.
To keep you from questioning their "business," they might send you occasional jobs that are either across the country or not at all what you're looking for. Not only that, when you do decide to cancel, they won't make it easy for you.
How to avoid: if you want the perfect job, find it yourself. And if you're that lazy, maybe you should stick with the job you have because no one else will want to keep you around.