Are we going crazy?

5 kids Mateo, Nova, Carl, Maria, Chloe, and Justin. They were all just out hanging out at the park and walking around. Then as they were walking they came across a baseball court and decided to hang out there. As they are talking and hanging out they hear a scream. They hear a scream and get scared. Knowing that Halloween is around the corner Justin tell them that it might be a prank. So they go to check it out thinking there will be a bunch of kids their age joking and screaming. But really it's a plastic bag. The inside is a dead body.