Grumpy Cat takes mound as handlers throw out first pitch at Arizona game

Is there a bigger Internet sensation than Grumpy Cat?

Wait ... don’t answer that for me.

But there is no denying Grumpy Cat is a big deal. She’s the source of numerous Twitter memes, but on Monday she was at the Arizona Diamondbacks game.

Even Arizona’s Chief Baseball Officer, Tony La Russa, got involved:

Who is Grumpy Cat? This will tell you all you need to know: