Here's a little irony. Disney is reconstructing the "Small World" ride, because the world ain't as small as it used to be. At least the people aren't:

The problem, quite simply, is that the flume that the boats ride in, and the boats themselves, were designed and built in 1963 on the assumption that the male adult riders would average 175 pounds and the women about 135, which they pretty much did at the time. Alas, those figures are as outdated today as the Rocket to the Moon ride.
The Small World ride now must accommodate adults who frequently weigh north of 200 pounds, which it often cannot do. Increasingly, overweighted boats get to certain points in the ride and bottom out, becoming stuck in the flume.

I hate it when that happens!