Important things, important things everywhere.
This is an internet meme, explained here if you don't get it: [link]
So the story behind this one is that in Elder Scrolls V Skyrim you, the Dragonborn, can join a guild called the Thieves Guild and your tutor and boss is a person called Brynjolf. His default line of dialog that he says if he has nothing else to say is: "Sorry lad/lass, I've got important things to do. We'll speak another time." This becomes especially irritating after you complete the guilds quests and pretty much save the entire guild. And after all that, what does Brynjolf has to say? "Sorry lad/lass, I've got important things to do." And he keeps repeating and repeating and repeating and repeating and repeating and repeating it! I saved the freakin' guild! The least you can do is say "hi, nice to see you, glad you're not dead"!! And this is pretty much the explanation that I imagine he has for me.
Edit*And now an update on this matter, I finally and throughly finished the thieves guild quest line and got named the guildmaster, there's a short ceremony everyone is there and Brynjolf says a few words and you get a new piece of armor. And Brynjolf actually talks about different things to you! And all you had to do is single-handedly salvage the whole sad excuse of a guild and raise it to it's full strength again! So I went away for a while, did a few jobs and came back. I saw Brynjolf and decided to talk to him about the new topic which becomes available during the ceremony. So I got to him and-
"Sorry lad, I've got important things to do. We'll speak another time."