Least Theoretical Openings

I am just asking this question in general. What are the least theoretical openings?

The Bongcloud

1...g6 with black, 1 g3 with white

@Ke2vsbongcloud The Bongcloud is very theoretically rich, which is why even GMs avoid playing it!

The Horsey Opening XD

English opening. I play it and do good with it without knowing much theory... I hope this helps.

Gambit

Play gambit lines that lead to sharp, tactical play. Budapest, Evans, Jerome, King's, Blackmar-Diemer, Botez, etc.

@KnightMaster07 Try 1. b4 b4 you listen to the others.

I'm surprised no one's bought up the London System yet. Though saying that I'm always left wondering what to do after the 6th move