Some brooks babble, but at Epcot the babbling is done by some of the enchanted drinking fountains! You can find at least three fountains that will talk back to you: 1) Face the "Fountain of Nations" with Spaceship Earth behind you. The talking water fountain is outside Mouse Gear, on your left. 2) There's another to the right of the magic/play fountain between World Showcase and Future World. 3) The third is behind Innoventions West, near the restroom.
It's bad enough that the water fountains talk, but you can also find a sassy talking trashcan in Future World, near the Electric Umbrella restaurant, next to Innoventions.