For an experimental user of energy drinks: something too tough to handle.
For regular users: a challenge to finish, bragging rights sold seperately.
For pre-occupied users: screw sex, they'd pop one over busting one.
For addicts: drinking 3 daily might as well be The Eleventh Commandment
"I can't believe those two hooked up. It was so BFC that I'm going to pretend it never happened and it will not be put on the chart"