A friend and I developed an emoji decorations feature, and I’ve installed it here.
You can create effects like this: 
f-wobble:
Here’s the list:
Different decorations appear in the auto-completion and the emoji selector:
More info (but I’ve pretty much covered everything):
Enjoy!
f-bounce:
f-bounce,flip:
Is it within the budget to create a :UPD: emoji of a unicyclist falling off a uni? That’s all I really want right now.
Seems a bit overcomplicated with the set of predefined effect, alas.
f-spin,flip:f-wobble:
I’m not sure I can do better than this and it requires hacky html:
<sup><big>:walking_woman:f-spin,flip:</big></sup><big><sub>:uni:f-wobble:</sub></big>
That said, I’m open to new effects… As long as my CSS skills can achieve them 
That’s plenty accurate, I’d say 
I suggest a minor update: 
f-spin,flip:f-wobble:
This does not look like a UPD though. Maybe this: 
f-bounce:f-spin: ?
I have had all three versions above, of UPD. All three are accurate, for me. 
f-wobble: 
f-bounce: Love it!
This looks perfect to me 
How did you manage to UPD in the front while the unicycle spins backwards? 
I imagine you riding backwards and somehow plunging in your forward facing direction when hitting a big bump.
f-bounce:f-spin,flip:
On a unicycle anything is possible. 