Possible Clues:

• Guffaw
• Loud, coarse sound that sounds like neighing
• Loud, coarse sound of amusement
• Whinneying yuk
• Hears ghoul moving around making a raucous cackle
• Loud hee-haw
• What you get when nag cracks up?
• Guffaw if her goulash is awful
• It may be heard on a funny farm?
• Mr. Ed's reaction to a good joke?