Serial Killer's Poem

Alright, listen up, you silly goose! So, like, the joke is about serial killers, who are, like, super bad people, right? And they're saying, 'Blood is red, veins are blue,' which sounds like a cute poem, but then they hit you with 'next one is YOU!' It's funny 'cause it's unexpected and dark, just like your brain sometimes, LOL! Maybe spend more time outside?