What’s your go to lines with cutting a customer off?

Just wondering how everyone goes about cutting a patron off whether they be too intoxicated or just plain old rude.

It’s one of the harder parts of the job for me, but very necessary. I try to walk the line of being polite and courteous but also blunt enough that they get the point.

For context I work in a very small intimate bar so it’s not easy to have private conversations. Could use some new material to work with