When the Clear Channel Outdoor Baltimore billboard company posted a local sign imploring the Patriots to "Bring it on," its Boston counterpart -- Clear Channel Outdoor Boston -- upped the ante (below).
The signs are up in Medford, Stoneham and Lawrence.
The Maryland billboard that started it all:
One of Bill Belichick's commands to his team is "Ignore the noise".
But it's getting tougher and tougher.