A concert can be a fairly scary place if you’re unfamiliar with crowd logistics. Wandering through Ozzfest with a boom-box perched atop your shoulder playing the Pointer Sisters’ “I’m So Excited” on repeat could cause some run-ins with fans. And security detail.

In lieu of the final leg of Britney Spears’ The Circus: Starring Britney Spears Tour, I’ve compiled an easy-to-read “Who’s Who” compendium of the nine types of Britney fans you must be aware of before attending Brit’s weave-fest at your local arena. Categories, like Ms. Spears’ song lyrics, subject to overlap.

And note: This list was compiled before Britney covered Alanis Morisette live in concert; we could’ve ID’d six more fan types based on that alone.