What if on one planet, 1+1=2, but on another 1+1=8. Because when you add things together on the second planet they automatically multiply by four. So when you make a single clone of something, you actually create seven cloned things.
So if you added 7 and 9, the answer would be 64.
Then we transport a mathematician to this planet and he causes an intergalactic incident by saying "No, one plus one is two." Because he hasn't caught on to the automatic multiplication. And two is the number of evil on their planet since it's not obvious as an answer to an addition problem. And then they bombard our planet with Mu-Radiation (a combination of Alpha- and Beta-Radiation, times four...duh).
And this causes everyone to quadruple. And then there are four of everyone running around.
It would be MADNESS!