When they were locked in meat locker and Chris found a paperclip
Chris: I hold in my hand the solution to our little dilemma.
Sharon: What? A paperclip?
Chris: Well, to the untrained eye perhaps, but to the dutiful watcher of TVs McGiver it's a veritable super-deluxe toolkit from Sears. And with it I shall loose us from this ... our watery graves.
This is making reference to the fact that MacGyver managed to use just about anything to make a complicated machine.