This week on A Prairie Home Companion, a lawyer, a blonde, a nun and a trombone player walk into a bar for a special joke-a-thon compilation show. Along with the slurry of jokes, VocalEssence sings the "The Ying Tong Song" from the BBC's "Goon Show," we'll pay tribute to the Marx Brothers and Tom Keith's utterly perfect chicken sounds take center stage for "The Sound of Chickens." Plus, Andy Stein's "Knock Knock" song, a visit from Sven and Ole, and a rather unfortunate school lunch was served at Lake Wobegon Elementary School.