Just look around and see what you like. If all you want is something to do every now and then, try Artix games (such as Adventure Quest, Dragon Fable, and Mech Quest), because they have funny amusing games with a sense of humor that... ok it's freaking mmos with a sense of humor so it wont get much mroe amusing...
Well anyway, if you're going to be serious, just look around and see what you like, BOTS is a really fun one, because it is pretty unique, and Fly FF is kind of amusing, but somewhat confusing.
I wouldn't recomend runescape, because the producers screwed it up quite a bit, and whatever you do, DONT TRY MAPLESTORY! Sure it seems amusing at first, but it gets really fucking boring really fucking fast. Even with hacks it takes years to get to level 30, and when you are level 30, big fucking whoop you get your new job and 1 skill point to spend in it, so you have to level up again jsut to make the new freaking skill you got worth using! Not only that, but if you make a warrior..... jsut dont play maplestory unless you're REALLY bored ok?
Hope I helped
