My votes for Most Unfair Riddles in Literature

#3: Bilbo Baggins to Gollum: "What have I got in my pockets?"

#2: Exeter Book Riddle #86:

"With cwom gongan, þær weras sæton
monige on mædle mode snottre
hæfde an eage ond earan twa
ond twegen fet, twelf hund heafda
hrycg ond wombe ond honda twa
earmas ond eaxle, anne sweoran
ond sidan twa. Saga hwæt ic hatte."

"A creature came walking where men sat, many in an assembly, wise in mind; it had one eye and two ears, and two feet, twelve hundred heads, a back and a belly and two hands, arms and shoulders, one neck and two sides. Say what it is called.

And my vote for the number 1 most unfair riddle in literature:
#1: Judges 14:14 -- "Out of the eater, something to eat; out of the strong, something sweet."