You are at a house party, in the middle of a drinking game. Hari has already said twice that he has had enough and has work in the morning.
He loses the next round. Someone pours him a large shot, and the room starts chanting: "Down it! Down it!"
The principle
Consent covers what people drink as well. "I've had enough" is a no. Pressure from a group is still pressure, and one voice is often enough to stop it.
If this brings something up for you
You can stop at any time. These UK services are free and confidential. In an emergency, call 999.