Blowing someone's head up

[A Horse With No Name]

Bit of a bombastic subject but I figured during the holiday season I might need to do something to get a few responses. :)

Would it be possible for a Druid to wild shape into something Tiny, fly into the mouth of a creature, and then wild shape into something Huge, and possible explode its head?

I know you can't enlarge person into too small of a shape. But I looked under Wild Shape and Beast Form, and I can't see anything that says this couldn't be done. Someone suggested that you can't transform into something that won't survive typically, like, a dolphin in the desert, but I thought that was a) more of a suggestion vs. a hard and fast rule, and b) the inside of one's body may not be the most hospitable, but it certainly shouldn't prevent it either.

Rules? If none, thoughts?

Thank you, Merry Christmas & Happy New Year.

[Cavall]

I've always wondered why in these examples it's the person not transforming that comes out losing.

[CampinCarl9127]

I wouldn't allow this for the same reason I don't allow mage hand to move the brain stem for a one-shot-kill. That is not the purpose of the ability.

I would just call it insufficient space to transform so the wildshape fails.

[Astral Wanderer]

The devs didn't cover that case because supposedly no one mentioned it before, but in all the covered cases where you don't have enough space, the rule is that you're expelled to the nearest free space big enough for you. Usually taking damage.
That's what I'd go with.

[Imbicatus]

There is an easier way to explode a head.

[cavernshark]

Imbicatus wrote:

There is an easier way to explode a head.

Interestingly enough, a druid can still do it by picking up that spell from the Supernaturalist Archetype from Occult Origins.