nope. just whip out my camera phone and tell them to not mind me.
Caught them "doin the horizontal bop?"
Probably not...but maybe...what's in it for me?
Really, it's none of my business...and as long as it doesn't affect me in any way, I don't give a shit. Just don't expect me to cover for you or lie for you to your "significant other."
I would congratulate them, take pics for posterity, and then ask if I could join. If they said no, I'd ask if they knew any girls for me to have my own fun with at work.
As long as it doesn't affect me, I'll keep my mouth shut.