OK, not mine, but my parents.

When I was a kid, we were ,making our annual trip, ABZ to ORF. Routing was ABZ, LHR, IAD, ORF. My mom is the only one who was not a US cit. Dad decided that with two kids, it is such a long day so we flew the ABZ to LHR the night before the LHR to IAD flight. We stay in a hotel by LHR, arrive at the counter fully rested and ready for a long day. Mom realizes at the counter that she left her visa on her nightstand. She had to fly back to ABZ and take the trip the next day. My dad, sister and I took the original routing. Mom loved taking the trip by herself without the kids. To this day Dad swears she did it on purpose.