I was once told of a pair of Phantoms intercepting a Bear in the North Sea around 1970. It was customary, particularly with two-seat aircraft, to take copious photographs, looking for any new aerials, etc - of course, the Soviets would be doing the same in return.
Their are blisters at the rear of the plane...
..and a crewman was noticed holding an object up in the 'window' as they photographed him. This was mentioned upon returning to base and the film was hurriedly processed, to see what new device this might have been.
It turned out to be a copy (or, at least the front cover ) of the station magazine from the Phantom's base - but, it was the next edition, which wasn't due out for a week....