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So, one day, I was at the grocery with my mom, and we were in the hygiene aisle. and I looked up to the top shelf and asked very loudly, "Momi, what's a doo-che?"
After quickly hushing me she explained that a douche was something you clean yourself with. Then I got the explanation on how they aren't really very good for you and all that. My mother held very little back, especially when it came to personal cleanliness and how to maintain our nether regions.
So I think I knew deep down inside exactly what the strange rubber bag was when I saw it in my grandmother's shower. And thankfully I was smart enough not to touch it.