"A good laugh is a mighty good thing, and rather too scarce a good thing; the more’s the pity. So, if any one man, in his own proper person, afford stuff for a good joke to anybody, let him not be backward, but let him cheerfully allow himself to spend and to be spent in that way. And the man that has anything bountifully laughable about him, be sure there is more in that man than you perhaps think."
Musing: Ishmael recognizes that he was the butt of the inn-keeper's joke when it came to sharing a bed with Queequeq, but at his core, Ishmael is a chill dude. And he is correct - if you can be the reason a person has a good laugh, look at it as a good thing. The last line in this section is thought-provoking as well.