Mr. & Mrs. Smith (2005)

After five (or six) years of vanilla-wedded bliss, ordinary suburbanites John and Jane Smith are stuck in a huge rut. Unbeknownst to each other, they are both coolly lethal, highly-paid assassins working for rival organisations. When they discover they're each other's next target, their secret lives collide in a spicy, explosive mix of wicked comedy, pent-up passion, nonstop action and high-tech weaponry.

Plot Keywords: bomb, assassin, secret identity, secret, assault rifle, gun, married couple, hitman, decoy, marriage crisis, marriage, job, dysfunctional marriage, gunfight, bullet wound