Love Thy Neighbour

Sometimes living in close proximity to an attractive person of the opposite sex can lead to more than just borrowing a cup of sugar. All too often, protagonists will end up falling in love. This can often lead to a minor character having a more significant role, or it could just end up as trouble.

Examples of Love Thy Neighbour include:

Advertising

The long-running Nescafe ads in both Australia and the UK where a man moves into the neighbourhood and is offered a coffee by his pretty neighbour. The Australian version was very sweet and the couple ends up married. The UK versions were a bit steamier.

Fan Works

In the Sailor Moon fanfic Isekai by Moonlight, the protagonist ends up in the apartment immediately next door to Makoto Kino, resulting in a case of Crash Into Hello in the first scene that leads to First Girl Wins.

Live-Action TV

Desperate Housewives. Susan and Mike would be the main example of this one.
Everwood. Andy and Nina.
Monica and Chandler from Friends lived across the hall from each other.
McLeod's Daughters. Tess and Nick. Alex and Claire. Alex and Stevie. Kate and Riley. Taylor and Patrick.
Neighbours. Enough said.