Before we got our kitten (2 years old) our older cat (8 years old) only had a handful of very similar meows. Sure, there would be tone so you could kinda guess what he wanted, but they were all variations of the same. The new kitten comes in, and she's a chatter box. She makes so many different sounds, you can always tell what mood she's in, what she's doing, and what she wants. It's lovely.

The problem with this is that she's started teaching the older cat new sounds, so on top of his normal sounds he'll occasionally make one that I've never heard him make before. And it's absolutely disorienting. He'll make a noise and look at me expectantly, and I will have absolutely no idea what he wants. He's always good to show me what he wants, but man must he think I'm an idiot now.