seller Lastactioncowboy makes these custom-screened Super Mario piranha plant underwear and sells 'em for a mere $17. Link (via Geekologie)
Custom Super Mario underwear - Boing Boing
Nintendo Boys Super Mario Kart Boxer Briefs Underwear, 4-Pack, Sizes 4-10
Thomas Heatherwick and V-Zug, Monocle on Design 640 - Radio
Color: Black
Nintendo - Super Mario Men’s Underwear
Nintendo Boys Super Mario Kart Boxer Briefs Underwear, 4-Pack, Sizes 4-10
Princess Daisy, MarioWiki
Super Mario Underwear Boys Large Size 10 Mariokart Boxer Briefs Fun Video Game
Multi-coloured Boys Super Mario 5 Pack Brief
3-pack boxer shorts - Mint green/Looney Tunes - Kids
Waluigi - Super Mario Wiki, the Mario encyclopedia
Luigi Logo Super Mario Bros Movie Mug Mario bros, Super mario bros, Super mario