An engineer, an economist, and a philosopher are hiking through the hills of Scotland. On the top of a hill they see a black sheep. “What do you know,” the engineer remarks. “The sheep in Scotland are black.” “No, no”, protests the economist. “At least one of the sheep in Scotland is black.” The philosopher considers this a moment. “That’s not quite right. There’s at least one sheep which is black from one side.”
You can replace engineer with ‘scientist’. I like this, as it’s the only joke that I’ve heard (with a bit of adjustment) combining the things I studied in undergrad, and it’s about the problem of induction too.