Redditor muffinman5423 built a TARDIS in order to propose to his girlfriend. It's a perfect model of the original that, from the outside, is a 1:1 scale replica. And it worked: she said yes!
What would he have done if she said no? Muffinman5432 had a backup plan.
Here's a video of the actual proposal. It's really sweet and touching.
My own proposal was less complex (you know, the KISS principle). My wife and I are both librarians and I coincidentally proposed to her at a library. She loved it anyway, despite the absence of a TARDIS. But she has informed me that if the Doctor ever offers to take her away on an adventure, she's going to accept.
-via Nerd Approved