And, is there a certain place to find the watermelon? Because I only found it once, and that was in math level in a trash of the staff only room.
To answer both of your questions. Yes, the hallway ends at some point, just keep walking. And the watermelon spawns in a random trashcan, one on the math and language level.
Alright, I went to the end of the way too long hallway. It‘s kinda cute and funny what‘s at the end, but it‘s not worth for dying because of Phonty.