If you answered with anything but the word, Never, then you are WRONG, just like the moronic hockey fans in Montreal and Philadelphia.  I don’t care where it started [Montreal] or where it finished [Philadelphia], you just don’t do that. 

Here’s what you need to do during the singing of the National Anthem, no matter what country’s national anthem is playing:

• Take off your hat. 
• Put your right hand over your heart or stand at attention
• Stand silently or sing if you care to and know the words.
• Show respect. 

Here’s what you don’t do:

• Talk.  And no stupid shouting to signify your team — that means you, Baltimore Orioles fans and Atlanta Braves fans.
• Walk, run or otherwise transport yourself [unless it's an emergency]
• Drink, eat, smoke or engage in any other carnal activity [I think you know what I'm talking about].
• Boo.

The National Anthem stands for something more important than national rivalries.  Show your true colors by standing up to those idiots who have no pride or respect.  Say something to the knuckleheads.  But do it AFTER the whole anthem is played.