I Found Something Gross In My Banana This Morning

What in the heck is this?! I am trying to eat healthier lately and decided to pack a banana for breakfast to enjoy with some almond butter.

I peeled my banana and realized it looked a little bruised. I broke it in half and realized it looked rotten on the inside...

Now, I'm afraid that all of the bananas I bought are going to be like this. What does it mean? Is it safe to eat?

What's the weirdest thing you've ever found inside of your fruit?