According to the doomsday websites, it could change the Earth's magnetic poles, and those int the A positive blood group will be played off in A minor, while those in the A negative group will become positively electrified.
For two days the Earth may go into Quantum Relativity, and the two opposite genders will be properly attracted to each other, marriages shall be redefined as between "two opposite poles", and same-poles will instinctively repel each other and "go straight".
Now for a massive haranguing from the "we are the world"
