When I was in third grade, my primary teacher (I was in the Gifted Program, so I had a "primary teacher" that taught English and Social Studies, and a secondary teacher that taught Math and Science) left midway through the year to have a baby and was replaced by this twenty-something woman with pretty much no teaching experience. She was a really nice girl, but she was gullible as all hell.
Anyway, so about a month in, we have this big book report due, and being the slacker that I was (and still am, to an extent), I didn't do it. But I knew I could probably get away with it. See, one of the students came around to each circle table (remember those?) where there would be a pile of reports. So this teacher (I just remembered - her name was Ms. Alexander) just had this big stack.
The next day I got called over to her desk - she wanted to know where my report was. Now, even as a small child, I was an excellent liar. I'm damn good at bullshit. So I just put on this confused look. The conversation went something like this:
Her: Where's your book report, Karl?
Me: What do you mean?
Her: Did you turn in your report?
Me: Yeah, yesterday.
Her: Are you sure?
Me: Yeah. It was on Charlie and the Chocolate Factory.
Her: Well, I don't have it here, Karl.
Me: Are you sure?
This went on for a little while. I don't remember how, exactly, but I convinced her that she'd in fact lost my book report. It was magnificent. I was such a little shit, even at 9.