Here we'll list all the different things we're not allowed to do when it comes to the king, in order that we don't lose respect for him. The Mishnah says that we're not allowed to ride on the king's horse, sit on the king's throne, or use the king's scepter. If others used these things, they would take away from the honor of the king. He's the only one who could use them because he's the only one who befits that honor.
We're not allowed to look at the king when he's getting a haircut. In the middle of a haircut, people could look funny. Some of his hair is long, some is short, some is up, and he could look funny, and you don't want to lose respect for the king. You're not allowed to look at the king when he's undressed. You're not even allowed to look at the king when he's in the bedroom. When it's normal for people to be undressed, all of these things would take away from the king's honor, and therefore they're not allowed. Like the Pasuk (verse) tells us, “Som tasim alecha melech (You should place upon yourself a king).” The awe of the king, the respect of the king, has to always be with you.