Bart starts visiting Grandpa and the other old people at the Springfield Retirement Castle as part of a community service assignment. Meanwhile, he has bought thousands of springs for a project that never materializes. The boy tries to scare some life into the old codgers, but finds that they like passing their days peacefully. When he takes them all aboard a boat for a little adventure, the boat sinks and nearly kills them. Luckily, the boat bounces back up on a pile of springs Homer flushed down the toilet.