Ich denke, es ist eine Anspielung an den alten Film "Das Boot." :-)

I was just guessing, but look at this:
http://en.wikipedia.org/wiki/Das_Bus
Most of the episode about being on the island is a reference to William Golding's 1954 novel Lord of the Flies.[6] When the kids are squabbling in the classroom, Principal Skinner restores orders by banging his shoe on the desk. Skinner's actions are a reference to the shoe-banging incident by Soviet leader Nikita Khrushchev at the UN.[7] The title comes from the 1981 film Das Boot, although it would be "Der Bus" in German.[1]

Ahh, danke, ich hab starr vermutet, der Englische Titel sei auch Englisch und bin dementsprechend auf keinen Nenner gekommen. =)