One of them signed up for a debit card so he could buy a new axe on Amazon, because it didn't accept a shipment of gold coins. A proficient identity thief, not knowing that the Viking didn't have much other money on the card, and thinking that this could be a lucrative deal, (a guy who buys medieval axes on the internet must be a rich hobbyist, right?) hacks into Amazon and uses his debit card to buy the axe himself, (And then some resalable electronics) before finding the account empty and going back to his mountain dew and Warcraft games.
When the Viking realizes that he isn't getting the axe, he writes an angry letter to Amazon, and when he gets a response saying that Amazon has indeed shipped the axe to the address given, he gets mucho pissed, calls over his boat full of crewmembers, and raids a used car lot, heading down a brutal warpath to destroy Amazon, and the identity thief. (And also meet some young, hot biker girl on the way or something. It seems to be an indisputable law that comedy movies need some degree of romance in them in order to be classy.)