Watch Out Bro

A mod made for Reddit User u/idiot770, based on this Reddit Post

It simply puts an overlay on screen whenever a Creeper is within 12 blocks of the player. I slightly modified the original post's UI to avoid covering the center of the screen so much, but it's mostly the exact same.

I believe it should be client-sided, but I made it in like 5 minutes as a joke so I very well could have messed it up. Regardless, I don't think anybody would be using it anyways, so not a huge loss.