Just remembered another one!
When DS was about 2 1/2, I decided I was going to give him a new "big word" each day, explain to him what it meant, and ask him to try to use the word in sentences throughout the day. The first word I gave him was "suggestion." After a few days of doing this and him not using the words in sentences, I had given up. A few days later (about two weeks from the beginning of this idea), I was trying to wash behind his ears in the tub, and he busts out with, "I have a SUGGESTION (said very loudly). Don't do that anymore."
Another one I might have already shared: My daughter's father cheated on me when I was seven months pregnant with her, so I broke up with him. I was really upset about it for a few days and pretty much laid around the house moping. One evening I was crying (I thought discretely) in bed, and my DS came and got in bed with me and put his arms around my neck. Here is the conversation that took place:
Chase (not quite 4 at the time): Don't cry, Mama. I'm here with you.
Me: Aw, thank you baby, that's very sweet. (crying harder as I hug him tight)
Chase (after two or three minutes of this): Mama?
Me: What, baby?
Chase: Could you stop crying now? I'm tired of hearing that.
Then I told this story to my mom the next day, and he goes: "I
was tired of hearing it."

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