Rays Fan Gets Ejected For Too Much Cowbell

Even security at the Trop gets annoyed at the cowbell.

From the Heater:

Andy Munkittrick, 27, came out of the holding room. He was banned from Tropicana Field today and tomorrow, which upset the two-year season ticket holder. He said he was ringing his cowbell according to etiquette after the second strike when a Red Sox fan behind him grabbed it and threatened to kick his a– if he rang it again Munkittrick rang it again. Police took him to the holding area, saying it was an “aggressive move,” according to Munkittrick.

My question: What exactly is cowbell etiquette?

http://www.youtube.com/watch?v=q4royOLtvmQ&hl=en&fs=1