There are three things about this that I love:
1. I had no idea there was such a thing as the annual Internet Cat Video Festival, but now I desperately want to go to one.
2. We live in an age when specific individual cats are famous. I don't understand why this isn't universally viewed as the most awesome thing ever.
3. Lil Bub and Grumpy Cat got to meet each other for the first time, and appear not to hate each other. This is just like when you think, "Wouldn't it be awesome if Crookshanks and The Amazing Maurice met by chance and became best friends?" only in real life. What? You don't think that?