Plainly, one mouse-clicking troublemaker can destroy reputations, move markets and panic populations.

CNN: BELIEVE IT OR NET

Netflix is currently 9.98% owned by infamous corporate troublemaker Carl Icahn and adopted a poison-pill defense to stop him from getting any more.

FORBES: As Netflix Goes Mickey Mouse, Take a Trip Back to the Future

In London the security service, MI5, initially - and wrongly as it turned out - dismissed Abu Hamza as just a noisy troublemaker.

BBC: End of an era as Abu Hamza to be extradited

Co-founder and CEO of Apple, Steve Jobs, was an incorrigible troublemaker until his 4th grade teacher took him under her wing and convinced him to focus on math instead of mischief.

WHITEHOUSE: Celebrating National Mentoring Month