I made pic related as a custom reaction image, and I can teach you how to do it.
Basically, I took the original image (superlative laugh) and put it in paint.net, masked/rotated it to match my reference (a scene of King Kittan from TTGL) and then applied a motion blue to it, incrementing the severity repeatedly while also turning up the brightness. At each increment, I saved an individual png, and in this manner I made all of the frames, then I stitched them together using this:
The other tools on the site allowed me to adjust the timing as necessary, and I think it came out with a striking resemblance to the original scene. I encourage you guys to make your own reaction images; it's fun and lets you express yourself while also providing 22chan with exclusive OC.
Granted, I don't think I've ever actually used this particular gif before.