I'm so pleased to be writing in this thread again.
This just happened tonight. My daughters are a bit older now (10 and 8, 5th and 3rd grade respectively).
5th grader has health class coming up that requires a permission slip. I forget whatever odd phrase they're currently using to name it, but it's sex ed. So, it comes up in conversation and my daughter, bless her, goes, "Wait, so there's not a guy named Ed teaching us?" We explain that it's short for "education" and she's in stitches laughing at herself. Third grader, who you may recall from previous stories about yelling "let the base drop" while farting on me and other such tales, decides to get in on this. She starts strutting around my kitchen saying, "Hey ladies, I'm Sex Ed, stay pretty" and then firing double finger guns. I literally have no idea where she gets it from, but it's probably the funniest thing I've seen in a few years. This kid just has so much sass, she's either going to end up a comedian or an offender, unsure which way it will go.