Jem and Dill made special plans for Dill's final night in Maycomb before returning to Meridian: They would make one last attempt to get a look at Boo Radley. They already had explained to Atticus that they would be spending the evening sitting "by Miss Rachel's fishpool," knowing that Atticus would be "so deep in his book" that he wouldn't notice them missing. Instead, they planned to peek inside the window off the Radleys' back porch. Scout joined them reluctantly, worrying that it might be dangerous. She was right. When a shadow appeared--probably Boo's--the children ran off, but a shotgun blast followed, and Jem was forced to remove his pants when they became entangled in the Radley fence.
This is certainly one of the most humorous chapters in the novel, and author Harper Lee seems to enjoy putting a risque spin on the evening's activities. It begins with the children's remembrance of Mr. Avery's peeing exhibition, followed by a contest of their own, one in which Scout "felt left out again, as I was untalented in this area." Jem later steps in chicken poop, and the three children felt "obliged to dodge the unseen from all directions" afterward. Jem forgetfully shows up amidst the rest of his neighbors in his underwear, and Dill's quick thinking excuse for why Jem has no pants--"We were playin' strip poker up yonder by the fishpool"--provides the reader with a good laugh, even if Atticus and Miss Rachel don't see the humor in the situation.