Problem: Interviewers lie.
I once interviewed with a company that brought me into a new, shiny, well-appointed building on the corporate campus for an interview.
I did well answering their questions. And they answered my usual questions correctly. Stuff like "Can developers here choose their own tools?" and "My title is going to be Lead Engineer, will I actually be a Lead Engineer?"
After I was hired, I found out everybody uses Eclipse, no exceptions, and I was absolutely not going to be leading anything (I was basically going to be used like an overpaid junior engineer).
The best part: "Oh, you won't be working in the new building..." and was taken to an old, windowless, leaky, mold-smelling building with peeling paint and flickering fluorescent lights (think the opening scene from "Joe vs the Volcano"). My office was a supply closet that was being converted into an office (by that I mean, "we just pulled most of the stuff out of here, but otherwise just rearrange the furniture however.") I was given an old 70s vintage desk that was too low, a sort-of broken chair, and a laptop and left to my own devices for three weeks while waiting for my new project to get started. Then I was suddenly moved to even worse accommodations - a cubicle, which belonged to an employee who had recently died (his stuff was still there, and it was a month before anyone came to take it away).
I started looking for a new job about 2 days in. Took me a year to find something else (I eventually had to move to a new city).