AFLAC Geyser (unofficial name) is located in the Lower Geyser Basin of Yellowstone. AFLAC while not much of a geyser has one of the best sounds of any thermal feature. See if you agree that it sounds like the "AFLAC duck".

AFLAC Geyser:

AFLAC movie (2.2 Mb, 10 sec, sound)

Image copyright 2001, Michael Frazier. All rights reserved.