As a MS teacher, I lament the fact that so many students are incapable of articulating intelligent thoughts (thanks to "text-speak" and the "no contact necessary communication" vehicles like Facebook, etc) let alone having good manners.
I've overheard so many students call home for things they forgot and the side I heard went like this:
"Mom. I forgot my bag. Yeah. You need to bring it. It's on the dining room floor. K. Bye."
I would blink up at the student and say, "Do you realize there was no question asked in that exchange, let alone an apology for inconveniencing your mom (mine would never have brought it - too bad!) or a 'thank you'? What gives?"
After getting fed up w/kids who would come stick passes in my face to sign without a word, I started putting my foot down about asking politely for things - leaving the room, signing passes, etc - and it was amazing and sad to see how many students had to be reminded HOW to ask for something politely. They needed a script! GOOD. GRIEF.
I want parents to know that MANNERS MATTER and make a huge difference in the way your child (and you, for that matter) are perceived. They show consideration and respect for others and WILL give your child the upper hand with his/her elders, relatives, teachers and future bosses. Please take the time to instill these habits, even when constantly reminding your kids is a pain. It's worth it - they shouldn't be a lost art!
Bravo to you, mom - I wish there were more kids out there who had been trained as well as yours.