Related Clues:

• It might begin, "Knock knock"
• Routine part
• Comic's delivery
• Routine element
• It often takes place in a bar
• One-liner, e.g
• It's bad when nobody gets it
• Knee-slapper, e.g
• Ordinary man accepting king is someone inadequate
• Common man embracing king: it's not serious
• Little woman eager (not half) to get something in cracker
• Quip, witticism
• Funny old king, having it in for Napoleon I
• Amusing quip
• Pun, maybe