Cone-ing, as it appears in videos by its inventor Alki Stevens, usually consists of placing another cone on top of an ice cream cone handed by a fast food employee, and taping it for the Internet. However, he sometimes places a topping on the ice cream, or unexpectedly otherwise subverts the ice-cream-giving process, and then speeds off.

http://www.huffingtonpost.com/2011/06/19/cone-ing-in-drive-thru-windows_n_880018.html

Thanks to Nathan R. for bringing this to the attention of the It’s Interesting community.