Based off a comment I wrote in this thread:
So, the question is, imagine life being a simulation. However, you and only you have discovered how to alter the codes of this simulation. You can only make one change before the simulation detects an intrusion and upgrades it's defense, making any more changes impossible.
Basically, if you could change only one thing in this universe, what would it be? It can be anything.
Also, you do not have to write in coding language.