[Encosia]

Being overqualified refers to employers turning applicants down, not job seekers considering themselves too good for the job. It doesn't make sense for an employer to spend the time/money to get you trained and productive if it's obvious that you're going to leave as soon as possible.

[stcredzero]

Pizza delivery guys with PhD's used to be common in Bloomington, Indiana in the US. I'm not sure if that's still true, but if I were an employer there, I'd try to find out if I already knew their thesis adviser in order to get some clue about how long they'd be sticking around and if they were about to get a grant that would let them stop working.