Pi day jokes

I'm a tutor at a school and me and my students are having a Pi day celebration and we are having Pie and Pi trivia. I would appreciate it if you guys gave me some Pi or Pie related riddles. Please nothing about sir cumference or magnum pi or moon pi or cow pi. I need riddles that I can't find by doing a quick search on google. Something short, sweet, and hilarious. Give me as many as you can please an thank you.
Edit: Or come up with a game based on Pi.
Edit Again: I should probably mention that these are high school students.

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