Recently, I have noticed that there is an amazing lack of common courtesy in simple interaction in restaurants. I am not talking about someone using the salad fork at the wrong course. People have arrived at a sense of entitlement that manifests itself as breathtaking rudeness.
When you arrive at a restaurant instead of telling the server that, "We'll need a high chair," try asking, "Could we have a high chair when you get a chance?" The server will almost assuredly will meet your request. If for some reason, this approach doesn't work, then take a more direct tack. Similarly, when ordering, instead of saying, "I'll have the..." try "Could I have the... ?" It doesn't cost you anything to be polite.
Please, please don't ask for a to-go bag at a buffet. I can't even believe that this point is not entirely obvious.
End of Rant