Possible Clues:

• It's funny how flattening it is inside
• Whimsical humor
• Jesting
• Quirky humour
• Comical quality
• Comic series of incidents; waggery
• Was in the aisles, almost, taken by subtle jest
• Jest; buffoonery
• Peer returned, playing lyre for amusement
• Howl head off in uninteresting display of humour