What happens if you go immediately from one sub to another?

[Shannon]

Turbulence is what happens when two subliminals are both trying to execute at once in your subconscious, and both are trying to achieve different goals at the same time and use all available resources to do so. When it happens, it can result in a variety of experiences, the most common of which is sheer exhaustion. Other things you may encounter are cancelling out of effects and results, headaches, strange and unexpected reactions, irritability, frustration and other things. It is generally not a pleasant experience when it happens, but it doesn't always happen. Depends on the specifics of which subs you're trying to use.