"Flash" Backs

I've been doing multiplication flashcards with the kids and had flashbacks of all the different things I've studied that way--multiplication, geometry, calculus, Latin, Greek, French, Euro and American art for orals, and now musical notes!!  I had to teach them a way of using the cards--testing yourself, making piles of correct and incorrect, repeating the ones you missed. Talk about deja vu.  Especially because I realize that I'm a bit rusty with my 8s!