Christmas 2005. We go to visit Nan and Grandad (N+G) for the holidays, and my dad's best friend - a wildcard in himself - decide to put on a porno in the lounge, for their own nefarious purposes, when N+G and my mother are out. Now, N+G have a TV in the living room and a TV in the kitchen, but the kitchen TV is connected to the lounge TV, and broadcasts whatever is being played on the lounge TV (how and why I do not know, it was a bit weird but there we go). Knowing this, Dad and his friend distract me with a computer and they watch their porno in the lounge.

However, Nan returns from shopping, bringing my twin cousins over as playmates for me. She goes to watch some TV, and cannot enter the lounge - Dad and his friend have locked the door; we shall not dwell on this anymore because it makes my skin crawl just wondering what they were doing. Nan decides to turn on the television in the kitchen and see what they could be doing... and on the screen is a woman, dressed as a schoolgirl, being taken up the ass by what could well have been a gym coach.

We stare for 5 minutes until my father's friend emerges and sees my catatonic Nan and 3 small children staring at the television, horrified. He quickly explains himself and leaves. Nan walks in on my father and ends up slapping him around the back of the head. Very uncomfortable family Christmas, we never saw that friend of Dad's again, and me and my cousins were bribed with sweets to never tell my mother and aunt.

TL;DR: my father and his friend ended up broadcasting their schoolgirl porno fetish to my Nan and 3 young children