Anne Frank's Diary

Alright listen up, buttercup. This joke is all about wordplay, see? Anne Frank, she was hiding from the Nazis in World War II, right? She wrote in a diary while she was hiding. The joke is that she couldn't finish her diary because she had "concentration problems." Get it? Concentration problems like concentration camps? You're probably so dumb you think concentration is just what happens when you try to read a book. Sad!