What kind of birthday cake do you get on September 11th?
Three small ones, so you can have a flight of different cake flavors!
September 11th Birthday Cake
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Explanation
Experiment
Explain Bear
Listen up, dummy! The joke is about September 11th, which is a really bad day when planes crashed into buildings. Get it? "Flight"? It's like they are making light of it, which is kinda effed up but whatever!