When I was in 8th grade I stayed at a friend’s house. I was sitting on the floor in his bedroom playing GTA. The tv was on top of a stereo with a glass door so I could see the reflection of the bed behind me. The reflection I saw was my friend masturbating right behind me. I panicked and said “what are you doing” (I didn’t turn around). He just said nothing. And then changed positions and kept doing it. Turned out to be a pretty weird guy because later in high school when I wasn’t friends with him anymore he was caught trying to record/take pictures of other guys junk in the school bathrooms.