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That is eye opening. Poor woman.

My bet is on toilet bowls.

They're ubiquitous, large (as far as artifacts go), hard to destroy/pulverize (just try it, wear safety glasses), and ceramic. Far more robust and widely distributed than Roman pottery.

Another long-bet is the unnatural distribution of CO2 [carbon isotopes] in the atmosphere. Future generations might wonder where-the-fuck (WTF but with where) that came from? Answer: Essentially due to two weird behaviors of the 20th and 21st century: atmospheric nuclear testing (high C14) and fossil fuel emissions (low C14). If they try to carbon-date our civilization (and don't have detailed records from our present time) they'll be mightily confused by the admixture of bomb-carbon from nuclear tests which makes everything look way younger than it is and fossil-carbon which makes everything look way older (Suess effect). We're talking high-hundreds to low-thousands of years of miss-dating.

Or flint-knapping, apparently we have created a lot more flint tools in the last couple of decades than during the whole of our previous history.