I had seen the headlines about the "It's a Small World" ride at Disneyland being shut down for an overhaul, but it wasn't until today that I read (at Wired) that the real reason for the shutdown is that
Americans are fat and the boats in the ride bottom out:
.. the boats routinely bottom out under the weight of super-sized riders, bringing the popular ride to a grinding -- literally -- halt. That's increased the wear and tear on the fiberglass boats, which have been in use since the ride opened during the 1964 World's Fair, when Americans, on average, weighed 25 pounds less than we do today.