The Awkward Moment as a Dance
The tip-toe is not a good move. That is exactly why it is the template.
Why an awkward move wins: a dance challenge that is impressive spreads as inspiration. A dance that is past saving spreads as recognition - everyone has felt the moment where the correct response stopped existing and the only honest thing to do is waddle on tiptoes. The goblin is the face of that moment, and that is why it is swappable.
Why the goblin is the variable: the uncanny goblin does the work of "wrong" - it is a character that should not be dancing, so it is dancing wrong, which is the joke. Swap in a celebrity and the gap is the fame. Swap in a cat and the gap is the cat having no business on tiptoes. The dance stays; the who does not.
How the game locks it: the character is the one swappable slot. The tip-toe, the scene, and the tip-toe beat are fixed - that is the awkward moment as a constant. Your job is only to pick the who and match it to the cringe the page throws up.