Here are 2 Little Johnny Jokes I just found:
Little Johnny is always being teased by the other neighborhood boys for being stupid. Their favorite joke is to offer Johnny his choice between a nickel and a dime — Little Johnny always takes the nickel.
One day, after Johnny takes the nickel, a neighbor man takes him aside and says, “Johnny, those boys are making fun of you. Don’t you know that a dime is worth more than a nickel, even though the nickel’s bigger?”
Johnny grins and says, “Well, if I took the dime, they’d stop doing it, and so far I’ve made $20!”
Teacher: “Little Johnny, give me a sentence using the word, ‘geometry.'”
Little Johnny: “A little acorn grew and grew until it finally awoke one day and said, ‘Gee, I’m a tree.'”
Little Johnny’s teacher asks him to make a sentence using the following words: defeat, deduct, defense and detail.
Little Johnny says, “De feet of de duck went over de fence before de tail.”