XKCD Isn't Funny - #1586 - Keyboard Problems
Randy totally did this twice before, but with worse punchlines. At least they're improving with time. And increasing in frequency, too. If the pattern keeps up, eventually XKCD will be nothing but amazing renditions of this same thing over and over.
So, anyone who's read Good Omens knows that this joke has been done well before. (and if you haven't read it, why the hell not, it's pretty good) However, in Good Omens, we got fairly detailed descriptions of how the guy tries to make technology work, followed by a description of the technology failing. It works for the same reason that so many Seinfeld gags work: failure is funny.
In this comic, the problems just happen to him, he doesn't cause them to happen. It's not even a particularly funny kind of problem. The idea of weaponizing it is nice, but it'd be so much better if we actually got to see it after a time skip.
In conclusion, I never really know how to end these things.