In my second year of Randonneuring, I bought a Giant OCR3 from one of my LBSs. A couple weeks later, I brought the bicycle back to change the stem, because I decided I wanted a shorter stem. To sum up, here's what happened:

1) They didn't recognize me or the bicycle, and questioned whether I had actually purchased the bicycle there, and whether they had told me they would be more than willing to make some changes to ensure the bicycle fit.

2) Finally convinced, they changed the stem, but criticized my decision during the whole process.

3) I asked about a "professional fitting" and they guy helping me (older guy, not a kid) told me that he read about bicycle fit in a book once, but thought it was all nonsense.

4) He inquired what sort of cycling I did, and I told him, with the comment that I had a 400 km brevet coming up the next weekend. His response. "You're an idiot. You should just ride part of it, and fake the signatures on the card."

Nice. I walked out and never darkened their door again.