"Most cracker jokes are puns" writes Susan Hunston. "They depend on words having different meanings (‘Why are Christmas trees very bad at knitting? Because they always drop their needles’2) or on two words or combinations of words sounding rather alike (‘What is good King Wenceslas’ favourite pizza? One that’s deep-pan, crisp and even’) or on invented words that sound like real ones (‘What do Santa’s little helpers learn at school? The elf-abet’2)."