Five things that should always be free at a restaurant

I'm not looking for handouts, and I don't think any restaurant is obligated to give things away for free. Upcharges for higher quality substitutions, a bill for chips and salsa and even an auto-gratuity is all well within a restaurant's prerogative.

But there are a few things that enrage me when I see them appear on the check, especially if a server didn't warn me first. Here are five things that I've been recently charged for in Denver restaurants or venues that should have been free.