Did I ever tell you this story? (Note that it happened a year or more ago, when Gong Zhu's didn't speak English as grammatically as she does now.)
Sponge is a big fan of Thomas the Tank Engine. Gong Zhu, then, has enjoyed a lot of Thomas . . .
One day we went by the part of the train yard in town where they keep the engines when they're not using them. We pointed them out to Gong Zhu. She looked at them for half a minute then very earnestly asked, "Why those trains not have eyes?"