This happened back during our March of 2007 trip. DW, myself, our 2 teenagers, and DW's 81-yr-old mother ("MaMaw") all went for a week long trip to the World. MaMaw could hardly walk, so needless to say she used a wheelchair during the majority of the time throughout the parks.
On one particular day (I think it was our 2nd or 3rd day of the trip, if I remember correctly) we had it all planned out to hit MK for a few hours in the morning, then leave around lunchtime, and head over to Epcot for the remainder of the day & watch Illuminations. So we arrived at MK for rope drop, hit a few of our favorites (HM, Pan, and POTC). After a quick bite for brunch at Pinocchio's Village Haus, we headed to the park exit & the monorail. We rolled MaMaw over to a good window seat, so she could look out as our monorail traveled. Surprisingly, Epcot seemed more crowded than MK on this particular day.
Maybe because this was approaching the mid-afternoon rush. We spent an exhausting (yet fun) day at Epcot, hit all our favorite rides, had dinner at Le Cellier, stayed for Iluminations at 11pm, then hopped on a resort bus back to FQ.
We get back to our resort room around midnite. We were all completely worn out after a long day, especially our 2 daughters. Just as we're about to call it a night, my oldest yells: "
MaMaw!!" Holy beef pudding, we forgot MaMaw back on the monorail from when we left MK earlier in the day!! It must have been because of all the commotion when we made the transition from the resort loop monorail to the Epcot monorail at TTC earlier, that we were just not keeping our wits about us, and accidentally left her over in the corner of the train.
Without hesitation, I sprung from bed, and (in my pajamas) rush back to TTC (luckily we had a rental car that trip, or else I would have been in big trouble). I drove as fast as I could without getting a speeding ticket. Got to TTC, and thankfully, there was some sort of EMH going on at MK that night...so the monorails were still running! I found our train, found MaMaw still sitting in her wheelchair by the window (who was pretty much speechless by that time, other than uttering "
Por favor manténganse alejado de las puertas" over and over and over again in a dazed & confused look.) I got her back to the resort, and we all took her to a 24-hr clinic in Kissimmee near I-Drive where they used some form of therapeutic meditation to get the automated safety speil from the monorail outta her head. Thankfully she was okay, and after sleeping for most of the following day, we were able to enjoy the remainder of our vacation with no further ordeal. After that incident, MaMaw was able to speak better Spanish than anyone I've ever known.