Charlie goes into the store and orders a Wonka's Whipple-Scrumptious Fudgemallow Delight. Mmmm.
The man behind the counter is pretty fat (this is starting to be a trend), and he gives Charlie the chocolate, which Charlie proceeds to scarf down as if he's never eaten before in his life.
When he takes the change, Charlie realizes that he still has plenty – one more couldn't hurt, right?
So he buys the second chocolate bar and... BOOM... there's a Golden Ticket. A Golden Ticket!
The shopkeeper starts freaking out, which leads everyone around to start freaking out, too. People are excited, confused, jealous, you name it. Two people even offer to buy it off of him – for two hundred pounds! (That's several hundred dollars, and back in 1964 when the book was written, that was worth even more than it is now.)
Charlie is in shock. Lucky for him, the shopkeeper is a kind soul and helps him get his ticket, get his change, and get the heck out of there. He can tell that Charlie really needs this.
On his way home – running as fast as he can – he passes Wonka's Factory and waves to it, knowing that he'll be back soon.