Grammar: i.e & e.g.

There's a scene in the move Get Shorty where Chili Palmer is being threatened by Ray "Bones" Barboni and his bodyguard. They get into a discussion about whether Ray has correctly used the term "e.g.", Chili correctly suggesting that "i.e." is correct.

Both of these terms come from Latin. "i.e." from id est, which means "that is"; "e.g." from exempli gratia, "for the sake of example". "e.g." is used whenever you are providing an example: "States that grow a lot of corn e.g. Nebraska, tend to be rather flat". "i.e." is used as a clarification: "States that grow a lot of corn tend to have little variation in elevation, i.e. they're flat.".

One thing that is true of both of these abbreviations is that you don't say "i.e." or "e.g.", you say "that is" or "for example" while writing "i.e." or "e.g.".