Purposeful (I think):

• There are 42 decks on the Enterprise NCC1701-D (The Next Generation ship)
• Fox Mulder's apartment number is 42

Coincidences?:

• 42 people died at Chernobyl
• 42-79 gigahertz is the natural vibration of human DNA
• 42-79 gigahertz is the natural vibration of white mouse DNA
• A marathon is 42km
• A 42mph wind brought down the original Tacoma bridge in the state of Washington in the 1930's
• A first star was found that has a planet circling around it. It is 42 light years away from earth
• Elvis's father died at the age of 42
• If you drilled a frictionless hole through the earth from one point to another it would take 42 minutes for gravity to pull you from one side of the tunnel to the other
• Only 42% of the 2nd class passengers on the Titanic survived
• There are 42 eyes in a deck of cards
• The right arm of the Statue of Liberty is 42 feet long
• There were 42 events at the first modern Olympics
• There are 42 rooms, including baths but excluding closets, in the White House
• The angle at which light reflects off of water to create a rainbow is 42 degrees
• The Cuban Missile Crisis was over the placement of 42 Soviet missiles in Cuba
• There were 42 generations between Abraham and Jesus
• The tank of a "Ford Fiesta" holds 42 gallons of gas
• The tank of a "GMC Suburban" holds 42 gallons of gas
• The first book printed on the Gutenburg press was a Bible with 42 lines on each page
• There is very often a 42 on the zipper of Levi's jeans
• There are 42 gallons in a barrel of oil
• The physical constants in the universe are the speed of light and the diameter of a proton. It takes light 10 to the -42nd of a seconds to cross the diameter of a proton
• The city of Jerusalem covers an area of 42 square miles.
• Napoleon graduated 42nd in his class at Brienne military school
• Elvis died at the age of 42
• This sentence is forty-two characters long
• Dogs have a total of 42 teeth over their lifetimes.