This is the 50th April Fool card.
I began creating these in 1974, but due to an inexplicable lapse in the Space/Time/Foolishness Continuum, all trace of 1975 vanished completely (this phenomenon has been referred to as "facete-flectitur tenebris foraminis" in the peer-rejected Journal of Incomprehensible Solopsisms.). It has since arrived dutifully on an annual basis.
I heard there is a submarine on your ceiling...
