Wedding fever? This could make it worse... or at the very least heighten expectations for how that proposal might go.
Could you get something like this?
"On Wednesday, May 23rd, 2012, I told my girlfriend to meet me at my parent's house for dinner. When she arrived I had stationed my brother to sit her in the back of an open Honda CRV and give her some headphones. He "wanted to play her a song"...
What she got instead was the world's first Live Lip-Dub Proposal."