HOW TO STOP A DRUNK FRIEND FROM DRIVING ON NEW YEARS EVE
Be cool and calm.
When people are under the influence, their emotional response is heightened, so they're far more likely to overreact and get defensive if you take an accusatory tone. When talking to them, it's critical to stay steady, not raise your voice, and maintain eye contact.
Come up with plan B.
Make it easy for your drunken friend not to drive. Suggest an alternative, rather than just telling them no. Offer them a ride (and a promise to drive them back to pick up their wheels tomorrow) or call a cab.
Use delay tactics.
If your pal insists she is not drunk and is absolutely fine to drive, then ask her to sit with you -- no drink in hand -- while you have a cup of coffee. The effect of alcohol diminishes with time, so the longer she can be prevented from getting behind the wheel, the better. And you can use this window to talk her out of driving.
Next time, plan ahead.
One of the smartest ways to avoid this dilemma is to name a designated driver before you head out. Alternatively, eliminate all temptation to drive drunk by leaving the car at home. Instead, catch a cab, take public transportation, or organize a pickup.