Plunge waterfalls are those that fall so forcefully they completely lose contact with the cliff face. Not something you'd want to get too close to! Environmental Graffiti found 15 of these falls, and will take you on a tour of them through a photo gallery. Shown here is Waireinga Falls in New Zealand. Link
(Image credit: Vinnie Hall)
I'll also point out that three of the waterfalls on EG's list in the link are not true plunge type waterfalls.