Woahfus Moment
Originating from the word "woah" and developing onto a combination of "woah" and "oof", a "Woahfus Moment" is something that takes you by surprise in both a context of a good or bad event. If something is really crazy then "Woahfus Woahfus" can be said to exclaim an emotion you're not show how to show.
Just been hit by a sudden realisation or something very funny just happened? Now that's a woahfus moment.