I've seen many good mentions in here, but there's one that's been left out. I'm not sure if the flow has slowed down over the years, or if it's always been like this. But, I give you: the backside of water!!
And the front side of water!
Ok... ok... sorry for the bad pun. But still- this is the waterfall behind Donald's Boat in ToonTown. I just noticed them on my last trip. Any insights to them, anyone? Or, not really...
IDK. I just find them interesting and wanted to throw them into the mix.