Whatever the reason, you'll want to be prepared.
In her book "301 Smart Answers to Tough Interview Questions," Vicky Oliver says in order to prevail, you need to "trounce your competition."
"You could be competing against someone with three times your experience, or conversely, against someone who can do the job at half your salary level," she says.
One of the best ways to stand out: have the smartest answers to the toughest questions.