Did you ever wonder why the Dursleys hated the Potters?
J.K. Rowling has released a new piece of writing on Pottermore.com, the home of all things Harry Potter, which gives some background. Here is an excerpt from the piece:
James was amused by Vernon, and made the mistake of showing it. Vernon tried to patronise James, asking what car he drove. James described his racing broom.
Vernon supposed out loud that wizards had to live on unemployment benefit. James explained about Gringotts, and the fortune his parents had saved there, in solid gold.
Vernon could not tell whether he was being made fun of or not, and grew angry. The evening ended with Vernon and Petunia storming out of the restaurant, while Lily burst into tears and James (a little ashamed of himself) promised to make things up with Vernon at the earliest opportunity.