i would be shocked that my house was destroyed while i was fishing?

what if gravity was reversed?

The first thing that we would notice is everything around us disintegrating and rapidly flying away. That would also be the last thing we would notice as we would no longer have an atmosphere to breathe. At the same time, the millions of black holes across the universe would simultaneously detonate, releasing energies rivaling those of the Big Bang. This energy release would vaporize all remaining solid matter, in addition to the disintegrating stars.

What if the weak nuclear force could act over long distances?

I would get disintegrated and plasmified.                                                                                                                                                                                                                                                          What if scientists discovered how to make good fusion reactors and many were built tomorrow?

The Earth would be a better place.

What if people only made good saves?

You would waste more time seeing every save because they were good.  

What if i could make 1 vertical space like everyone does? Because i can't.

Nothing would change, he already would have to use the return button to make the single-space return.

What if the return button was never invented?