Jolly Roger = kids on board looking for playmates, or does to me anyway. An ex-submariner friend on seeing that the flag locker held a Jolly Roger had, in his own words " a moment of confusion", to him it had a rather different meaning!
No. I've got one just like it, and yes it's raised every time my 8 year old son and friends are aboard...either that or I've to "walk the plank" /forums/images/graemlins/grin.gif