You have to run your thumbnail along both of the wide sides of the case. The one with the seam goes face down.
Considering I've had that happen with VGA/DVI and other connectors, I'd say that's just a USB issue, it's an issue of all connectors being connected blindly. If you look at a USB connector and still mess it up, I have some bad news for you...
You stick it in if it doesn't fit you flip it over how freakin hard is that?
Obviously none of you people have tried to plug a USB plug into the back of an iMac by touch alone.
The problem with USB is that its rectangular. Who the hell remembers whether the seam goes up or down, left or right? I plug in external drives multiple times a day on multiple machines and I have no freaking clue which way they go, because I have more important things to pollute my brain with.
You think you have it right as you feel around the back of the Mac, but you try it and it doesn't go in, so you flip it over and try again, but it still doesn't work, so you drag the cables up through the cable-tidy hole in the desk to spin the thing around, or otherwise stand up and peer over the back. And it turns out you had it right the first time, just not lined up properly.
I'm not a freaking idiot. I've been using Macs for the better part of 2 decades, and USB since its intro. I have 5 Macs on my desk of various another two under it and two more on another desk behind me. I have four external hard drives, two flash drives, a printer and two iPod cables.
You try and remember which way every cable goes on every computer. Frankly, I'd be more worried about the obsessive Sheldon-ish loser who
does remember all of that, than the person who does what every normal person does.
And you're dodging around the fact that image was from memebase, and is funny. And I still stand exactly behind my original point. Or in front. Or behind.