Gaining

I can only think of ways that are too complicated. Anyone?

all I can think of is the Simpsons episode where they time homer how long his blubber jiggles for.

"woohoo look at that blubber fly"

Richter scale?

Requires a "standard poke" as mentioned previously.

Hehe, might prove inaccurate at lower weights.

And, maybe slow-mo video could be used? Seems like the best answer to me, since it shows the amplitude and range of the ripples better than normal speed video. (speaking of which I need to get a video editor so I can make some slow-mo jiggle gifs...)

Perhaps the situation in which you notice jiggle in which body parts? Like belly or butt jiggle when running, when walking quickly, every single step etc.. All the way up to arm jiggle when reaching for a snack .

Actual ripple time is going to be tricky.

I had a thought. Posting videos of your favorite body part jiggling. I mean, if it jiggles enough to be featured in a video, then obviously it jiggles! I have posted my fat rear and my belly. (rear is better, more jiggle!)