Bad Customer Service

Now it's obvious that at work you can encounter lots of strange and rude people, especially if you work in sales. Though, what about when the tables are turned and you are the polite (ideally, but optional) customer and you encounter just plain terrible customer service?
I don't mean bad, or "it was an off day" kind of thing, but rather stuff that just shouldn't happen very frequently, if not, at all.

An instance when I went to the mall the other day:
1) I walked into Radio Shack greeted by the standard "Are you looking for anything in particular?"/"May I help you with anything today?" Okay, so it's standard stuff so far. I was eyeing Ipod speakers on a whim and to kill time, so a couple of seconds after I say "no thanks, just looking," I'm just browsing and the guy comes up again. He sort of asked me if he could help me with anything again (I wasn't even eyeing the speaker section intently) and then ended up "testing if my ipod would fit onto the dock." After that I'm sort indifferent, since it was really nice, but $300.00 I put on my pod to listen and crouch down to move on to the cases section. Then the guy starts to snap his fingers at me almost immediately after I crouch down and take a brief look, to tell me "this case over here's pretty good," even though he commented earlier on how nice my case was when seeing it earlier (note I'm listening to my music at this point). After that part, he would have followed me to the back of the store had I not rushed towards the back very quickly after he was tied up with greeting more customers. On the way out, I took the side route to avoid any further possible contact.

2) I have quite a few cases where at a fast food place, all the teens for the particular shift were particularly airheaded and inattentive and forgot my order multiple times. The worst was at the Harvey's near where I work, where they forgot my burger order a couple of times and almost made me late for work with no explanation after 30 or so minutes of waiting. I dislike eating there since the staff consists of the same apathetic individuals each time since I always go to work weekly at the same time.

Jam it back in, in the dark.