And to picture everyone in the nude.
(Heard this one so many times, don't know how it actually helps nerves :sarcasm)
I find this helps when doing a speech, it might seem important to you but no-one really cares, they just want it out of the way. If everyone is doing one then do yours first, everyone is thinking about their own and pays you no attention whatsoever.
Don't be like that, you should count yourself lucky you even have chicks in your class. Poor cricketdudemad only has blokes to picture nude.I'd probably get too distracted from the chicks in my class.
Structure + humor = winning combination.