My students' writing topic was "If you could send one modern item back in time to one specific era, what item and era would you pick?". Huge range from "bicycle to China, 500 BCE" to "rabid badger to Boris Johnson's college room, 1984".
@fishidwardrobe @fesshole Might be more entertaining to throw goedel's incompleteness theorem at him--in its mathematical form.
"Oh, y'all worship sqrt(2)? That's mighty cute."