Batboys

Just saying Bruce is one hundred percent the kind of dad to keep a twisted part from the first time Dick drove (and crashed) the Batmobile, just the symbol from Barbara's original home made bat costume, the first Batarang Jason ever threw (correctly, still got a smudge of blood on it), his tooth from when Tim knocked it out with the Bo staff, one of Stephanie's many Robin headbands (she was slightly obsessed), a printout of the first file Cass typed up herself, and the crossword puzzle from the first time he and Duke met.

I feel slightly honour bound to educate myself, so chip in guys with the cultural norms for you. My parents personally tossed the baby teeth (while holding them with tissues or gloves) at the first opportunity/my sister and I buried hers for fun (but I'd never before heard of someone keeping them).