Odyssey, your two year old is more quick witted than most adults! (The knock knock yodel joke was good too. I intend to make someone laugh/groan at it later today. LOL)
Grace29 -thanks, it took me a while to work out the reversible year -but you might want to amend the question - from 'this century' to 'last century' (or omit the word 'century' and put 'from 1900 to 2000' instead.)
Juno, I loved the 'pumpkin pi' one!
Nikita007 ,I loved the 'what is another other word for Thesaurus' and the 'is there an imaginary cure for Hypochondria' !