Shrek (along with cat and donkey) is in the hinterlands looking for the king's distant cousin, Arthur, voiced by Justin Timberlake and presented here as a medieval high school misfit with confidence problems. (philly.com)
The VC Confidence Problem, PEHub, July 29, 2009. (angelblog.net)
I understand most of a list like this, and how some of these phrases could cause confidence problems with coworkers; but there are two phrases included here, at least in my books, that are essential to a healthy work environment: «try» and «I don't know». (slaw.ca)