Hypothetical situation for you.
It's November 2nd, 2010. It's a cold day so you have a jacket on, concealing your sidearm. You and the wife decide to go out to eat. You get to the restaurant and since there is no "no firearms" sticker on the door, you keep your gun on you and go in. It's quite warm inside so you take your jacket off and sit down to eat. Halfway thru your meal, someone notices your pistol and complains to the management. The manager confronts you and tells you that you have to leave the establishment.
Do you,
A: pay for your partially eaten meal, put your jacket on, and quietly leave the restaurant.
B: quietly leave the restaurant without paying for your partially eaten meal.
C: Discuss the issue with the manager, explaining that since there was no signs on the doors, that you're completely within your rights to carry your pistol and refuse to leave until you've finished your meal.
D: Get up to leave but quite loudly let your feelings known about the 2nd amendment and threaten to never eat there again.
E: Leave, but bust a cap on the complaining party on the way out. (JOKE!!!!!)
A, or it's trespassing and theft (or whatever the charge is for an unpaid meal). I definitely request a to-go box, and I'd tip my waiter well. That'd show 'em.