E-G-I-E Whoa

You use "e.g." when you want to give an example of something.
-I like candy, e.g., Snickers, Warheads and Starbursts.

You use "i.e." when you want to specifically name something you just referenced.
-I like that spooky holiday, i.e., Halloween.

You point out the difference when you want to look like a dick.