I know the chances of this happening in May are slim to none, but still, be aware of conversations conducted among yourselves. Similar to being ignored, coming upon a group of animated employees is intimidating. I personally find nothing more annoying than trying to get the attention of two employees who are talking to each other. As the temptation to keep telling a story is often too great, confine your friendly discussions to breaks, lunches and after hours. Adapt to the situation.
Every customer is different.
Although they should all be treated with the same amount of respect, they can't all be handled the same way. Learn how to read customer's needs and moods. Adapt your sales pitch to meet their personalities. It's not as hard as it sounds. Customer's facial expressions and body language give you plenty of clues.