I hope you guys can help me out. I'm trying to find an effect. Best way I can describe it is a distortion effect. It's got that double image effect that you'd often see with 3D footage without the glasses - except with more of a rainbow colour rather than just red/blue. It's very quick and lasts a few seconds - making it very subtle. Hope you guys know what it is!
I'll post some pictures so you guys have an idea of what I'm talking about.