Worst flight I was on, I was 14, coming home from a church event out west. Layover in Las Vegas. I ended up sitting between this couple on the leg from Vegas to Cleveland, they were probably in their 30s or 40s, drunk. Had just met the week before, then spent the weekend in Vegas, got progressively drunker on the flight (they started out fairly tipsy). One insisted on the aisle seat, the other the window seat. They talked/yelled over me the entire flight! The rest of my church group was like 10 rows behind me, and when we got off the plane they were full of stories about the couple that I was sitting between. They were so loud that my group 10 rows back could hear them!
I think I'm still a little traumatized by that plane flight.