Well, this colloquium talk I gave was essentially a narrative about how we reduced a model of a complex phenomenon down into a single subtraction. The moral of that story was that the math itself wound up being simple, but the things on either side of that ol' minus sign were complicated.
I didn't know who my audience was going to be, and I'm used to audiences that don't care about math. At all. It turned out that this audience was a highly technical organization, solely interested in mathematical and methodological nitty-gritty. The group and I had .. mismatched expectations.
But, hey, they had invited me to speak, so...
I'm giving exactly the same talk to a philosophically-oriented audience next month. What a relief that's gonna be.