When my kids were little, I would cut their sandwiches on the diagonal and lay the points together, and they were butterflies. While I was making the sandwich the other night, I told her I'd make her a butterfly sandwich, that my kids loved butterfly sandwiches when they were little. (Actually, they still ask me for them!)
She politely replied, "I just want cheese on it."
I could tell she was still nervous about eating butterflies, even after my assurances that the sandwich didn't really have butterflies in it, and she was delighted when I presented her with her Butterfly Sandwich and realized it truly did not contain actual butterflies!
Below is a Butterfly Sandwich I made my son years ago (we take lots of weird pictures at my house!). Click on the image to enlarge it ... there's a face on the pickle!