Idioms and a brothers talk

It is so funny to me that kids take expressions very literally (especially special ed kids). My class is doing an idiom project where they have to use fifteen idiom in sentences and make this book about it. There sentences have to show me they get the meaning of the word. They have 'check points' along the way, so I know that they are at least doing some work and on the right track. Procrastinators have a hard time in my class because I make them break it down. Anyway, here are some sentences that didn't quite hit the mark and I find funny:

For: "put my foot in my mouth" (they could change the pronouns if needed)

1) My sister is so loud that I told her to put her foot in her mouth so I could go to sleep.

2) Kate is so good at gymnastics that she can get her foot in her mouth.

For: "jump the gun" (this kid argued that it is drop the gun)

1) My dad dropped the gun so no one would get shot.

There was a lot of explaining to do on that one.

For: "eats like a bird"

1) She eats like a bird because she likes seeds.

On a completely unrelated note, the grade had their puberty talk with the nurse and PE staff earlier this week. I decided I LOVE this day. It is just too funny. Their reactions are priceless to me! Anyway, I thought this year was relatively mellow until a parent came in to see me the next morning as I was setting up. We had this interaction:

Mom: Good morning, Ms. F, can I come in? I have to share my son's reaction to the puberty talk to you because I don't think he gets it.
Me: Sure, what happened?
Mom: Well, he came home with this little goody bag of stuff (deodorant, diagrams) and he was pumped to tell me about it. He took out the diagram. He was like, 'mom, did you know my voice is going to get lower?' and 'do you know I'm going to get hair in all the places dad does?' Naturally, his two younger brothers came over and Michael started sharing what he learned with them. When he started explaining what he knew to my younger boys, I realized he didn't quite get it.
Me: Oh?
Mom: Yeah, he told them that one day they will go to the bathroom and instead of pee sperm will come out. He said to his brothers, "isn't that so cool? no more pee"
Both the mom and I were laughing and she continues...
Mom: So, do you think my husband and I should do a review course with him? Is there any harm in him thinking this?
I explained to her how the program is really about body changes as opposed to sex so he may not get that piece of it yet, and it was up to her as to how/if she wanted to clarify this with him.
He missed the boat a bit.