I walked in on my folks when I was about 6. He was doing her doggy style in the bathroom bent over the toilet. I cried. I thought he was hurting her, and they were so into it all they did is shove me out and shut the door, while mom yelled "I'm ok!"
I actually blocked that out for many years, and didn't remember it till somehow this very topic came up with my cousin, I think he had mentioned walking in on his mom. My dad told the story to him, and he asked about it. Then it all flooded back.
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Some people are like slinkies, they aren't really good for anything, but they still bring a smile to your face when you push them down the stairs.