Silk

You open up a spellbook and read a random page...

Floaty stuff, for all your bouncy needs~

You're wondering around an old house when...

Many different scenarios with more "realistic" sizes. Good for prompts.

Involves various kinds of inflation. (i.e. Soda, Air, Water, Et cetera)

A bit more of a realistic inflation shindan for those of you who aren't into the whole "diameter in the quadruple-digits" thing, focused primarily on air/gas inflation. You can imagine belly or body inflation, either way.