Cookie Rings dipped in ketchup. As a tot. I was trying to think of the most unusual thing I've ever done, and that topped the list. Amazing how I've forgotten that until now.
Back in the 60s and 70s, there was a brand of cookie rings made in Cincinnati called "Mama's Cookies."
They were extremely popular in the area because they sponsored a daily, live children's TV show that featured them throughout each program.