You are in the park. there no one there, but you looked at a bench that has slime on it. A kid must have spilled it.

you hear someone in the slime? "Hey! Hey! Down here, please help me. I'm Stock in the slime. Help!" He is pleading for help.

You see a 4 inche small guy in the slime. He is covered in the slime, and it looks like he has been there for a few hours or less. a kid must have put him in there.

Tiny people like that usually don't get treated like humans, more like a pet or a pest.