Aunt Bethany: What's that sound?
Uncle Lewis: You couldn't hear a dump truck driving through a nitroglycerin plant.
Uncle Lewis: You couldn't hear a dump truck driving through a nitroglycerin plant.
Aunt Bethany : What's that sound?
Uncle Lewis : You couldn't hear a dump truck driving through a nitroglycerin plant.
http://www.moviequotedb.com/movies/national-lampoons-christmas-vacation/quote_35352.html