Unicorn Theory

Unicorn Theory, is based around the idea of something that isn't necessarily possible, but isn't impossible, simply due to the fact that weirder things have happened, and will continue to happen forever, meaning that something described as being part of Unicorn Theory, may eventually happen given enough time or the correct circumstances

Dudebro 1: Dude, do you think (Female Friend) would ever go skinny dipping
Dudebro 2: Maybe bro, but it probably won't ever happen, bit of a Unicorn Theory.