- Wear a fedora. It's, like, the coolest kind of hat there is. People will compliment you on your snazzy hat, and then you can tell them about all the other hats you have at home. You'll wish you had an extra head, so you could wear two snazzy hats at once.
- Start using Linux, which is like the fedora of operating systems. It's better, in fact, because while there are only so many things you can say about hats, you can talk to anyone at all, as much as you want, about Linux. Do they not use Linux? Tell them why they should. Do they already use Linux? Tell them they're a goddamn idiot for using Red Hat, when everyone knows Ubuntu is the best distro. And who the fuck uses Pine anymore? You get the idea. Also, if you learn enough about Linux, you could probably get a job in IT. I mean, like, maybe. I don't know. Linux people and IT people talk the same kind of gibberish to me, so it seems natural.
- Wear a utilikilt. For too long, men have been shut out of the benefits of wearing skirts. Now you can wear a skirt that is not only manly, but has a system of pockets like cargo pants. Tell everyone you know about how liberating it feels to wear a utilikilt, especially if you're not wearing underwear with it. Oh yeah, did I mention? It gives you an excuse not to wear underwear, something else women have bogarted for too long.
- Learn a lot of jokes. You won't ever have to say something in a conversation that isn't a joke.
- Learn a lot of random trivia. The quick and dirty way is to pick up one of those giant trivia books, and read it cover to cover, maybe keeping it in the bathroom to read while you're on the toilet. You can also do this, of course, by reading lots of non-fiction, because those books are frequently peppered with interesting asides. If it's interesting enough for you to commit it to memory, then it should be interesting enough to tell someone you just met. Hold on, did they say something about space shuttles? Now's your chance to talk about Richard Feynman testifying before Congress on why the Challenger exploded! Also, speaking of Richard Feynman... yeah, once you're talking about Feynman, you can talk about anything.
- Start making things out of duct tape. You can even make a fedora out of duct tape. (I don't recommend a duct tape utilikilt.) Don't make those foam-padded boffers, though. Those are dumb.
- Take up some old lady type of crafting, like knitting or needlepoint, and make video game-related things. You don't even have to play any video games--just pay attention to what video games other people are playing, and making jokes about on the internet. I've never played Portal, but I'd make a needlepoint of the companion cube, and have it say, "The cake is a lie." If I did needlepoint. Anyway, if you had something like that on your wall, everyone would tell you how awesome it was.
These are just some ideas. You might find a new and creative way to get by without a personality! There are no limits! Maybe you want to do nothing but consume popular culture, so that you can talk about those things with other people. Start with The Wire, because, seriously, everyone should watch that show.
Now, not everyone who does the things I just mentioned is trying to replace their personality. Many of them have brilliant, shining personalities, and when you touch on that point of common interest with them, it will allow you to spend a lot more time around them, potentially leading to things like meeting their friends, going to their parties, and having one-night stands with any female they know.
But that guy with the duct tape fedora and the utilikilt? He also uses Linux, and he thinks he's hot shit just because he uses Gentoo. That is some bullshit. Go tell him how much of an asshole he is.