I think the best ironic wedding song is "Every Breath You Take". You hear that at weddings all the time because it sounds like a love song on the surface. After actually studying the lyrics, you realize it's about a stalker...
You've said that before, but I'm afraid I still don't get it. There's some lyrics here and I still can't find anything beyond a sweet, if slightly drippy, story of unrequited love -- an actual stalker, it seems to me, wouldn't often be ending up under the same umbrella as the object of his or her affection. If the couple's life story includes a bit where one of them overcomes their fear of rejection to pop the question to the other one, it seems jolly fitting.

Or are you saying that all blokes who keep schtumm about an affection they know won't be returned, count as "stalkers"? That seems a little harsh...

Peter