The one case that really sticks in my mind though was when I took a 13" Macbook (pro I think) in to have the keyboard replaced (the trackpad stuck). It was a US model with a US keyboard that I'd bought off the company I used to work for, and I figured that while they were replacing the keyboard they may as well put a UK keyboard on. The Apple reps on the phone, then in store both said this was a reasonable request (as I also thought) and so I left it with them.
I get a call a day or so later saying that they couldn't do the repair because "they had to replace components like for like". Bear in mind this was a paid for repair, not under warranty. I was willing to pay for the parts and labour. Apple confirmed that the new UK keyboard would work, but they weren't allowed to repair the laptop with a different keyboard. Nothing I could do could change their mind, I'd hit a complete brick wall. No keyboards could magically fall through the cracks in the back room and no favours could be done. As reasonable a request that all involved continued to think this was, they wouldn't do anything.
They even called around local apple dealers and none of them would do it either because they were all constrained by Apple's back-office systems.
In the end I bought a genuine, brand-new top case (keyboard, trackpad, integrated battery) off eBay and did the work myself, it worked just fine. No idea where it came from originally.
I guess this shattered any remaining idea I had that Apple was anything other than a machine. The operations side made so efficient by Tim Cook is also incredibly inflexible and as soon as you stray outside the bounds of what it has accounted for you hit a wall. As friendly as the geniuses and store employees are, Apple is not your friend.