I believe that head could start generating it's own gravitational pull effecting the tides, moon even the climate.
Anyway, he first told her the bad news...
Dr: "Rosie, I'm afraid you have an incurable flesh-eating bacteria. There is no chance to survive, as every antibiotic known to man has failed to kill it."
Rosie: "Damn!" "Well what's the good news then?"
Dr: "Well, it will take about 87 years to consume all YOUR flesh, considering you girth and ever-increasing giant melon head!"
Dada-dum! Thank you, thank you.... I'm here all week! Try the veal!
BlackIrish, speaking as one Oirish person to another, shouldn't you recognize what O'Donnell's Big Head is actually made of: