Hmm, OK I guess. I wasn't aware that XKCD had attained that level of representation of CS as a whole (or I guess a paper-based SQL injection, even though simply naming someone a SQL injection string doesn't necessarily require it be paper based).
you'd be surprised. i have a bunch of friends who read XKCD for some of the generically geeky content, and to who i have to explain a lot of more technical punchlines to. including the premise behind little bobby tables. there's a lot of people whose initial exposure to a CS concept is through XKCD, which solidifies that relationship into the future.