Frankly, I would not do voice-overs in this fashion.
It should not be the goal of the DJ to bring tears to people's eyes at a time when they are obviously already struggling to maintain their composure.
This tactic creates unnecessary anxiety is very much akin to the talk shows that would spring a "surprise" on an unsuspecting guest. We all know and understand how dad might be feeling right now - it is patently unkind to exploit him in this way.
A photograph of dad's tears is not what the bride wants to remember about her father 20 years from now.
Voice-overs belong in broadcast and recorded audio-visuals presentations. They are not for setting people in order to demonstrate some artificial "power of the DJ."
Both the bride and dad are going to cry today. Neither of them needs my help, and nor shall I appoint myself to determine when or where that shall occur.
One of the most revolting concepts in pop DJ culture right now is this notion of wedding DJs eliciting tears from thier patrons. It's not magic, and it's not professional. They are already on the verge of tears - pushing them over the edge requires no special talent. A true professional supports them in their effort to display every ounce of diginty and compsure during a very signifcant life transition.
LOL... I was going to just thank this post, but had to clarify that while I don't necessarily agree with the conclusion, the logic and take behind it is awesome, and it is definitely a vantage point that should not be dismissed lightly.
Awesome post!