Bitcoins, the official currency of Dudebros.

But! For laughs, Krugman slapped the title “Bitcoin Is Evil” on his post. Though he never actually argued that Bitcoin is evil, that was enough to uncork the wrath of the Bitcoin army, which bombarded Krugman with what he called “rage-filled missives.”

Not satisfied, Krugman further poked the bear by calling the Bitcoinistas “humor-impaired.” He also called their mothers hamsters and declared that their fathers “smelt of elderberries”, proving once and for all that Krugman is actually French (hi, Monty Python).

huffingtonpost.com