I just remembered one of my 'CRUD MONKEYS!, I'm turning into my grandmother' moments that started off as a ridiculous thing she criticized us for. When we were younger (under 18, but not little anymore) she would take me shopping for clothes a few times a year (grandparents all but raised us). When it came time to buy underthings, I'd gravitate to the dark colors (having PCOS, my cycle wasn't always predictable, and dark colors showed mistakes less). My grandmother would always get outraged when I picked out black ones, though - she'd say "your mother would kill me if we came home with black panties!" I swore I'd NEVER restrict my kid's choices that way - it was ridiculous!
Then I took my (brand new to me) stepdaughter, then 11, shopping for underthings. She wanted to buy several pairs of black panties. I said "your mother would kill me if we came home with black panties!". Then I clapped my hand over my mouth, and put all six pairs in the cart. She looked at me like I was nuts until I explained the story, and since then (even now, ten years later) she teases me about buying her black panties.