As long as they're empty... I can't stand it when people waste good beer. Thrown AT them? No. Thrown on the ground 5-10 feet from them to get their attention? I don't see a problem with it. If you can't throw ANYTHING on the field, then we shouldn't be able to throw visiting team's home runs back, either. Ummm, you really don't see a problem with someone throwing a beer bottle onto the field to get someone's attention? Wow. It's a horrible thing to do. Plus, I don't think John Q. Fan is talented enough where there's a difference between aiming at the player and 5-10 feet away from the player. Either throw is just as likely to hit him. And, at least at GABP, a fan is NOT allowed to throw a homerun ball back onto the field. I don't see a problem with throwing plastic beer bottles at somebody if you can even reach them. A glass bottle would be bad because it could shatter.