“Now, I’m not all mean. I considered ordering you to just drink it all up again, but instead I’m going to give you a choice here.
One, you can take three nice big gulps of it and earn yourself a small reward.
Two, you can drink the whole glass to earn yourself a big reward.
If you reach the point where you feel like you can’t stomach anymore without puking, I want you to take another three big gulps before stopping. You’ll still get the big reward then.
And finally, you can drink nothing at all and miss out on any rewards.
Decide now.”