"Grab your ruler and slap your balls, gently at first, then harder. Set a timer on one minute and always increase the force of your slaps. This is where the fun starts, atleast for me, hihi"
"Good, I hope you are enjoying this as much as I do. Still you have much to learn! I have already had students which have done 1m30s when I said do it for a minute. They tried to impress me wherever they could. Some were even allowed to touch me, but I think you will never be able to impress me like that, are you, hihi?"