Kids Say The Darndest Things

Lately, Cookie Cookie has been reading a lot of silly jokes that pop up during her online reading lessons. She regales us with all sorts of plays on words on a daily basis. Today during her Science lesson about plants she came up with one of her own that I thought was simply hilarious, especially coming form a 6 year old. She said, "What does a plant do when it needs to go to the bathroom?"

 Honestly, I thought the answer/punch line was going to be nonsensical as many of her made up jokes are, but this one was spot on and very funny. It makes me happy on top of it all that she is starting to understand the nuances, oddities and some of the more innocent double entendres in the English language.

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 I promise you will laugh :D.
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You are going to hate me for this ;), but I want to know how you would answer this question before I tell you her punchline. Please leave your silliest answer in the comments. Come back tomorrow and I'll tell you what Cookie Cookie had to say.