Manners!

I don't have a huge blog about this but just a question....

What happened to everyday manners?

I hold the door, say thank you, please and I don't pick my nose in the line at the salad bar. So why is it, no one holds the door for me? I am not asking for someone to open the door for me, just hold it when I am behind you! I got it slammed in my face way too much today!!!!