Not sure if this has been asked before but I couldn't find it in the search facility.
Mine is Che Guevara and Fidel Castro smoking a Havana cigar in the Sierra Maestra shortly before entering Havana in the Cuban revolution in 1959.
The reason I chose it was because I'm a revolutionary socialist and like cigars and slippers (you can't see the slippers in the pic!).
All good things
TDA