I created this rhetorical analysis addressing "Good Girls Go Bad, for a Day" for my college-level Comp I students this spring. It worked sooo well. The products were the best rhetorical essays I've received--ever. In the instruction sheet I include very straightforward information on what to include and how to write a successful rhetorical analysis.
The essay they have to analyze is an entertaining editorial for the NY Times by Stephanie Rosenblatt. It takes a humorous, vivid, articulate, and creative look at what she feels is "a trend" toward very trashy Halloween costumes.
There are so many great examples for students to analyze--many obvious--which makes for a successful early attempt!
By the way, this lesson does an excellent job of meeting Core Standards for informational texts and writing: W.11-12.1,2 RI.11-12.2,3,4,5,6
*Please also see my rhetorical analysis assignment addressing "On Eating Animals" by Namit Arora! I also have one on hoarding.