Parallel Universes? Mind boggling?

Every decision you make results in a new universe branching out from your. Lets say in one universe I pressed the "R" key on my key board but in another I pressed "T". Small choices like that and a infinite amount of universes branch out from such a small unnoticeable decision. Honestly I find it hard to believe and if anything is possible that means a parallel universe of humans have invented a means to travel to our universe explaining UFO's maybe? Crazy as this sounds, ah who am I kidding I am crazy and this is the biggest load of BS I have ever Written Good night.