15. Ah, the ol’ ‘keep your friends close, but your enemies closer’ trick.

When I broke up with my ex she started trying to befriend a girl I liked, and wanted to ask out (and did, and got a yes from). One day she invited my new GF over and there was a big montage of pictures of my face on the wall that apparently stayed up for another 18 months, 12 of which she had a BF for.