I was rummaging through my parents room looking for something I needed when I was younger (can't remember what) when I placed my hand on something unpleasant. I knew what it was without even having to look at it. I later scrubbed my hand down to the bone and never looked through that room again.
I must've had some scarier moments, but my most recent one came last year. In class I drew an extremely detailed picture of coitus, with liquids and everything. I then passed it down to another kid, but my teacher saw! She approached me, and my face literally turned white. I was halfway to fainting, but without looking, she told me to throw the paper in the garbage. Phew.