What’s the dumbest thing you can do this New Year’s Eve? Well, according to Mayor Gavin Newsom, it’s shooting your gun.

San Francisco authorities announced an increased presence this Thursday in hotspots such as nightclubs and the Embarcadero where thousands are expected to say goodbye to 2009.

Newsom, in his latest YouTube update, said police will be out in full force.

“You can’t be out there drinking heavily in public,” Newsom said. “You can’t be out there with your own fireworks. Use common sense. You can’t be out there … discharging … your weapons. This is the dumbest thing you can do. It’s a felony and we’re going to step up enforcement of that.”

Also, Newsom doesn’t miss a chance to show off some of his legislative prowess. Muni is offering free rides on Thursday and Newsom says it was his legislation while a supervisor 10 years ago that made it possible.