And that's how we got kangaroo, which means, "I don't know." "Hey, you, what's that... that jumpy thing over there?" "I don't know." "Ah! An I don't know,

And that's how we got kangaroo, which means, "I don't know." "Hey, you, what's that... that jumpy thing over there?" "I don't know." "Ah! An I don't know, eh? Spectacular!" (note: it appears that there is reason to believe this old story is untrue, but it still serves to illustrate a real and hilarious problem when speaking across languages)