Once, while boarding the PeopleMover with my nephew (who was little at the time), I told him, "Be sure to buckle your seatbelt––this thing goes upside-down!" Of course, my nephew knew I was joking (especially when he saw that there were no seatbelts).
But the family standing behind us in line did NOT know this, and they heard my "warning" and took it quite seriously.
Apparently, they were extremely concerned about falling out during the upside-down portion of the ride and were upset that they could not find their safety restrains.
To that family–wherever they are: I'm sorry!