O for crying out loud, everyone should know who Inigo Montoya is by now. The name isn't even flagged by the auto spell check that plagues Apple.
     Besides, Inigo is the most noble character in The Princess Bride. Wesley is an ass you know.
     What, you like Wesley? He's a mass murdering pirate. Montoya is yes a mercenary but we see his honorable nature throughout the film. Wesley is, again, an ass. He even toys with Buttercup.
     And Buttercup, come on, she just wants a slave boy. As you wish my ass.
     Anyway, I see no cause for alarm in anyone wearing a T-shirt bearing Montoya's famous announcement.
     Unless of course you're the Six-Fingered Man who killed his father.