Flashy Animations

[Letho]

Hey guys, I have a little (probably not so little?) question regarding animations. I'd like to achieve a flashy screen, like shown in the video below (@3:40):

https://youtu.be/TANs-B-khnU?t=217

I have read myself into animated controls and bezier functions, but I don't get how to achieve a triple flash using a three-point-bezier-curve (which is what i should do, as far as I understand it). Could somebody help me with this? (Achieving it without stretching a semi-transparent controll all over the screen would be even better^^)

Cheers,
Letho