And how did he get off the bottom of the ocean?

The following is a conversation heard as a ninth-grade English class watched the 1997 Baz Luhrmann version of Romeo and Juliet:

Student: (Randomly, after having watched approximately 75 percent of the film) Hey! That's him! That's that guy in Titanic.

Teacher: Yes, that's Leonardo DiCaprio.

Student: (Pondering.) How can he be in two movies?

(The room is more silent than any moment in the entire year, as even the dumb kids stare at her blankly.)