I do believe that everything we can imagine can in fact happen. The concept of infinity encapsulates even our imagination. Conversely, I would even be as bold as to say that our imagination can only go as far as it can BECAUSE it is tuned into the multiverse.
Think of your brain as a radio on the receiving end. Think of the multiverse as a giant satellite dish emitting infinite signals. When your brain is tuned into the right station, then a particular idea that is specific to that “station” pops into your head.