I'm waiting for the right opportunity to ruin a marriage
Excuse me? Why do you want to ruin a marriage?
I feel like after these couples gets married they will be very boring and not worth my time.
Married couples can be boring sometimes but it is not good to ruin their marriage so that they separate and become more exciting. It could just lead to more drama and fights.
I'm only trying to make a point and I think it will spice things up.
I really think you shouldn't interfere with others' relationships. They may be boring to you, but to them it could be the best feeling in the world! How about trying to talk with them and understand their dynamic, and what makes it so comfortable?