Guido is training to be a waiter at the hotel. Eliseo gives him a situation, and Guido explains how he'll prepare a dish, help a customer, etc. In true Guido fashion, he makes it more complicated and energetic than it needs to be.
When it comes to bowing, Guido bows too low, and Eliseo reminds him that he's there to serve, not to be a servant. Serving is a supreme art.
Guido and Ferruccio are in bed in Eliseo's house, and Guido's amazed at Ferruccio's ability to fall asleep on command.
Ferruccio explains that he uses a trick he learned from the philosopher Schopenhauer. Using willpower, he thinks about being asleep, and then he's asleep.
(Do not try to use this an example of Schopenhauer in Phil 101.)
Guido tries it himself, and his loud version of willpower is able to instantly wake up Ferruccio. Amazing.