Holy Rainwater Batman!

It's raining. You're walking down the street with your umbrella up. You see an ex-boyfriend approaching you. He doesn't see you, and you execute a perfect, subtle shake of the umbrella as you pass, depositing all the excess water on his Armani suit. Result.

Or.

It's raining. You're walking down the street with your umbrella up. You see an ex-boyfriend approaching you. He doesn't see you, and you use the gun that is filled with rainwater (as collected from the top and sent through the metal pole) to ambush him, soaking a rather obvious patch of his crotch and making him look like he wet himself.

It's all about the scatter-gun versus fire bomb approach you take to exes...