Okay, a pilot and his/her dog, to be politically correct. Travel Insider has a lovely comment about the recent case of the two pilots overshooting their airport because they were, ahem, inattentive.
There is a probably fictitious account of certain airplane engineers who claim that all the cockpit crew needs to consist of is one pilot and a dog. The dog is there to bite the pilot if he touches anything and the pilot is there to feed the dog.