Next thing they know, a bright pink boat being rowed by laughing Oompa-Loompas comes down the river and they all hop on.
Right away, everyone starts causing trouble: Mike Teavee is licking the boat, Veruca is demanding a pink boat of her own. Charlie, on the other hand, just marvels at everything.
Willy Wonka can tell Charlie is enjoying himself and so he dips a mug into the river and gives it to Charlie and Grandpa Joe to drink. Yum. Think really thick hot chocolate.
Suddenly, the boat enters a pitch-black tunnel and everyone screams. Willy, apparently taking after his Oompa-Loompa, starts singing a rather creepy song himself.
All of the parents except Grandpa Joe think that Mr. Wonka is nuts. Flat out crazy. And they're pretty vocal about it.
When the lights are switched back on, they can see the signs on the doors inside the tunnel. They're all pretty punny (that's funny, but with a pun), including things like "STOREROOM NUMBER 77, ALL THE BEANS – CACAO BEANS, COFFEE BEANS, JELLY BEANS, AND HAS BEANS" (18.46).
Mr. Wonka doesn't pass up the opportunity to take a low blow at Violet after she talks back to him.