The Bah Humbug Dancing Light-Up Hat was made by PBC International in 2015. It is a red, white and green elf hat with lights around the top of the brim that light up red, yellow and turquoise. It has the words "BAH HUMBUG" on the brim in green. It moves back and forth as it plays a rock version of "I'm Gettin' Nuttin' For Christmas".
Bah Humbug Dancing Light-Up Hat in action: https://youtu.be/aI88uB3w1AQ