The boys are young, sharing a hotel with parents on the run.
"I don't like this one," Dhaymin says, ear to the wall. "The pipes sound funny."
The flood when Jen flushes the toilet proves Dhaymin right; the "I told you so" earns him bed without dinner. (Jen shares his, smuggled under the covers.)
Years later, they're chasing monsters alone—and still staying in cheap motels.
Dhaymin can only listen now, but Jen listens to him, and they call the manager to swap rooms.
Come morning, they're greeted by sounds of water and cursing next door, and Dhaymin feels vindicated.