The tipping custom originated in England when small sums were dropped into a box marked T.I.P.S. --TO INSURE PROMPT SERVICE.
She paused in the doorway, tipping her head to consider Brittany, who only glared. "You're right. I think most girls don't look like the tooth fairy dresses them every day. - Wendy Knight
The name given to that one dramatic moment in an epidemic when everything can change all at once is the Tipping Point. - Malcolm Gladwell