Field equipment

A biologist phones his wife from his office and says, "Honey, something has just come up, I realize it's not my field season, but I have to visit my field site for a week. So, would you pack my clothes, my field equipment and my blue silk pajamas? I'll be home in 1 hour to pick them up."

A week later he returned. "Did you have a good trip, dear?" his wife asked. "Oh, it was just a typical field trip, you know, work work work," he exclaimed, and added "But you forgot to pack my blue silk pajamas."

"No I didn't," she replied. "I put them in the box of field equipment!"