This my dear readers (how few of you there may be) is Randall.
Randall the Enamel Animal. Randall is an organoleptic hop transducer module invented by Dogfish Head. Basically what happens is you fill the chamber with hops, spices, or whatever, then you pump your draft beer through the filter and the alcohol strips the flavor from whatever is in the chamber.
“It’s named that because when you drink a really hoppy beer, it feels like its ripping the enamel off of your teeth.” – Dogfish founder Sam Calagione