A Classic Opener

"This is your second hour of sitting down and receiving, and this is my second hour of giving"

"I'd prefer it with the lights on...."

"..larger than anything you've ever experienced..." (the class size? or something else.....)

"..tossing a coin..." (ostensibly miming flipping a coin, looks more like another kind of 'tossing')

"what's the probability of getting [a] head?"

"does it need to be harder, faster?"

"Don't worry, it gets hard of its own accord...." (a classic end too!)