Norwegian Heavy Metal T-shirts 

Note the text in Norwegian: "Ingen av disse bandene finnes, altså, vi prøver bare å lure noen utlendinger."

"None of these bands are real. We are just trying to fool some foreigners."

The fake band names are funny though: Office, Hair Dryer, Ear Muffs, Brussels Sprouts, Backpack, Marching Band, ...