What is the most amusing random thing you've ever witnessed?

Have you ever happened to witness some totally impromptu event that cracked you up? It doesn’t matter if you were involved in it or were just an observer. If you have a favorite personal anecdote, please share.

I still laugh about an incident that happened nearly 25 years ago when I was a young legal secretary. I was hurrying down the sidewalk after work on a cold, blustery and very rainy day, headed to the garage where I kept my car. As I neared a men’s clothing store to my right, a man emerged and paused under the awning to open his automatic umbrella. He pressed the button and instead of opening, the still-closed canopy portion of umbrella shot completely off the shaft with great velocity, as if fired from a cannon. It landed on the ground directly at my feet, sat for a millisecond and then burst open in all its useless glory like some sort of insane mechanical flower. The man and I never spoke. He just stood there looking amazed. I burst into uncontrollable laughter, but kept going because it had really started to pour. To this day I wonder if he’d just bought it and if so, I hope he got a refund. The store is now long gone, but every time I walk past the building I remember and it still makes me laugh.