Caution: Watch for backstabbers, career breakers and emerging megatrends.

That warning should come with each IT job, but it doesn't. As a result, most IT professionals have stories about the ones they never saw coming.

A few of them shared their tales in hopes of saving you from experiencing the sudden jolt of your career hitting a wall, the view from behind as a megatrend streaks away or the sickening thud of an unexpected hit from your blind side.

Straight Through the Heart

Former CIO John Stevenson remembers grooming a particular employee to someday succeed him. But after two years of working well together, the relationship underwent a radical change. "That person was anxious to take my chair much [sooner] than I realized," Stevenson says.

He learned from a colleague that his protege had been plotting a career assassination for a few months, spreading rumors and undermining Stevenson's authority. "It was sudden and a surprise," he recalls. "It was affecting my ability to lead the organization.

"And," he added, "it could happen to any manager in any job."

Stevenson struggled with how best to handle the situation and eventually followed some tough advice from a colleague at the Society for Information Management (SIM). "I was getting to the point of anger and angst, but he said to be calm about how I approached things," explains Stevenson. "He said all I could do was hold my hand out and turn the other cheek and see what happens. And by turning the other cheek and doing what I should be doing -- and that's open and frank communication and embracing people at all levels -- I outlasted him. Others saw through what he was trying to do. He eventually resigned."

Stevenson is now a SIM Foundation board member and president of consulting firm JG Stevenson Associates.

The Errant E-mail

As an IT architect at a large vendor, Jeffrey Callan has his own bosses as well as those at client companies. He also has peers at competing firms, although he sometimes collaborates with them while working for client companies.

Callan successfully managed these complex relationships for about 25 years, until a peer used a collaborative situation to land a deal that both vendors had sought. Callan says this peer got an edge by questioning Callan's work at the client company, bringing into doubt his IT competency.

The move caught Callan by surprise, but the fallout from the situation was even more surprising. Callan's own bosses asked for his assessment, which he provided in a frank e-mail intended only for internal review. Somehow, though, that e-mail ended up not only at the competitor's company, but also at the client. It put Callan in the awkward situation of having to explain his words to the client.

Callan continued to work for his own company, and he worked with the client company for 10 more months. But he learned to watch what he writes, making sure his e-mails are carefully worded and providing only as much detail as necessary, with no personal notes or emotion.

"If I have something [sensitive] to tell someone, I make sure it's the old-fashioned way -- 'Let's talk' -- because e-mails are so easily forwarded," Callan says.