Teaching programming h;lp

I'm going to teach programming to somebody who's going to study it more formally in a year, but wants to be learning part of it in the mean time.

What SIMPLE, CLEAN, STRUCTURED language would you recommend me to use for teaching? Please, refrain from language wars as this is not a fanboy thread but a serious question. Before yuo mention it, I'm not going to start with either Python or Ruby because they're too complex and get too much in the way, and no, I'm not stupid enough to start with Java because a radical OO language (and a crappy one at that) with a shitty enterprise API is not the best either.

I'm thinking Pascal. As much as it sucks, it has strict/anal types (it's better to start anal than to start easy-going and botch it), simple yet not messy syntax, simple stdin/stdout input and output to play with (that's all I'll need), and none of the complexity of OO. Yet it sounds so useless. But I don't know of other languages that meet these requirements.

right now I'm worried about teaching programming, not a particular language, so I want it simple and purist.

I'm surprised no one has mentioned Scheme yet. Beautiful language, very pure, very simple, no gargantuan, poorly implemented standard lib that you have to learn before you can do anything nontrivial, and yet still very powerful and expressive.

Oh yeah and it comes with a free book designed specifically for teaching: http://mitpress.mit.edu/sicp/