I try very hard not to fall into the trap of making generalizations related to ethnic or racial groups. However, I must make a gender-related exception. There seems to be something about how the average woman's brain is wired that the concept of source switching on a TV set is virtually impossible to comprehend. I have just had yet another hopeless tech support conversation with a female friend/family member that got "stuck" with cable or DVD material on the TV screen when they wanted to view the other. Adding to the fun, the female in question was attempting to use a universal remote control which also required mode-shifting to make sure one had the remote set to control the correct component (another concept apparently particularly difficult for the fairer sex). Making the tech support challenge harder in this case, the manufacturer of this TV apparently chose not to use the fairly ubiquitous "TV/Video" label for the source-switching functionality, obviating my usual strategy of yelling "TV/video button" over and over into the phone until I get a response. Fortunately, my second guess of "input" seemed to match a label on the remote.
Yes, I know, all you women will now be rushing from Lawrence Summers' house to mine to set up protests. I still think that with women dominating on things like relationship management and hygiene standards, and men leading mainly on understanding television source switching and programming remote controls, that women are probably still ahead on points.