Fate in a sense certainly exists and while it can not be proved, it can be reasoned using obvious logic. Everything that occurs does so because of a set of previous occurrences coming into conjunction. In the case of a person making a choice, the choice is decided upon using a large collection of categorized biases. All though biases are based upon others and so on. All of which leading back to a singular particle that developed down one path instead of only one other possible option and thus paved the way for the entire universe. Down to a simple electron, all are choices are inevitable. The bonding of two atoms being possible and two others being impossible is all due to the biases of those atoms, which are thusly because of the biases of an electron. If you continue down the scale you would find the particle that started the entire process leading up to what you choose to eat for dinner tonight. To say that the universe doesn't follow a set path would mean that random occurrences are possible. This is however not the case. An experiment to prove this statement and my argument as a whole, I'm using the word "prove" a bit strongly, would be to think critically about what a random occurrence is. If you can establish any sort happening or effect that is with a cause of any kind, then I am wrong. Keep in mind that unknown causes are still causes.