h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

It was french class, which I do fairly well in, and the teacher was asking each member of the class, one by one, what they did over the weekend. You would think this wouldn't cause anyone to worry, but my french teacher is a special case. Every time somebody made a mistake, she asked them to redecode their sentence word for word, and explain without help why they were wrong and why the right answer was right. This does help us learn, but it makes me nervous because my french teacher is very intimidating.
So I wondered what I would say.
I had gone window shopping with my sister, but I didn't know how to say "window shopping". I could have said "shopping through windows" but that would sound insane and I would have to disect my sentence. I could say that I had gone to a Star Trek exhibit at a museum, but I don't want anyone to know that I'm a trekkie.
I thought.
Then I realized that I had spent a large amount of time on the computer, it having been recently brought back from the grave. That was easy enought to say.
"What did you do last weekend?" my french teacher asked.

"I watched the computer." I answered.

I had just made a huge mistake. I had said that I "watched" the computer, which sounds insane. Fortunately, the french teacher gave me a second chance.

"You watched the computer? You WATCHED the computer? Why did you WATCH the computer?"

I couldn't admit that I had made a mistake, because then I would have to go through a long maze of why I am supposed to say one thing instead of another. So I went to my second choice in answers.

"I watched the computer so it wouldn't run away."

And there I made a bad mistake in verb tenses. For the next ten minutes I explained what my mistake was and what was the right thing to say and why.

So close!

Tell her I am watching my computer even as we - er - speak...