Oh I have dozens of stories about GC fail encounters. I'll just post a few for now.
1. One day I was in, and checking out a Soldano cab. I ask the floor manager what speakers it has in it, and he takes off the front grill, examines the speaker cones for a moment, and says, "Well it doesn't say the name of the speakers on front like it usually does, so they're probably nameless soldano standards"
2. I go in asking if they carry Sperzel locking tuners, and he tells me that there is no such brand as sperzel. I argue with him for like 5 minutes until I finally get him to look Sperzel up to see that they exist on his computer, and after seeing the site he simply says "Oh well they must be a new company"
3. I'm looking at the used equipment section, and I see one of those old 90's crate heads for cheap, and to make sure it was the amp I was thinking of I ask a guy hovering over me "Is this the amp that a lot of those death metal bands were playing back in the 90's?" and he responds "I dunno, but I wouldn't by that if you want high gain, come take a look at the new
Spider IV amps, those have the best distortion on the market"
4. I'm in the amp room, trying out a JVM, and a guy comes in and says "Thinking about buying that thing?" (I wasn't really but to get him out of my hair I said: "Maybe, I am pretty set on getting a Mark V though" and of course they had a JVM there and not a Mark V so he says "Forget about the Mark V, those suck. They have no character and are built like crap. The JVM will do what you want way better than the mesa shitty"
My GC sucks.