can of worms vs gasser

can of worms

noun
  • A troublesome situation; an issue whose resolution is difficult or contentious but not necessarily complex. 

  • A complex, troublesome situation arising when a decision or action produces considerable subsequent problems. 

  • Used other than figuratively or idiomatically: see can, worm. 

gasser

noun
  • Something highly entertaining or remarkable. 

  • More generally, any car or truck that runs on pump gas, as opposed to diesel fuel, racing fuel, or a car with an electric motor. 

  • One who gasses, or poisons with gas. 

  • A kind of hot rod based on production models from the 1930s to mid-1960s, stripped of extraneous weight and jacked up using a truck beam axle to provide better weight distribution on acceleration. 

How often have the words can of worms and gasser occurred in a corpus of books? (source: Google Ngram Viewer )