James Roday

... was an undercover Mexican. I had no idea until the USA Characters commercials outed him as half-Mexican:

And then whenever that commercial was on and he would say "I'm half-Mexican," I'd jump up and be all like, "Meeee toooo! That's m... I'm ... Meeeee tooo! .... Sweeeeeeeet!"

Anyway, real name: James David Rodríguez. Here he is as a white guy playing a Mexican of some sorts in "Lights, Camera... Homocidio!", the telenovela episode of Psych:

That's a gooood episode.