True Story
A coworker was just telling me that he and his family were watching "50 First Dates" and in the movie a conversation came up about the size of a walrus' genitalia. One of the characters said that "Wow, with that you'd have to use a Hefty bag for a condom!"
Their 11-year old son turned to them and said "Mom... Dad... what's a Hefty Bag?"