Candace Mistaken for a "Mummy"

Candace stumbles into a storage room at the movie theater's basement shortly after being chased by a giant bubblegum ball. She ends up wrapped in toilet paper like a mummy, and can only moan incoherently thanks to having a mouth full of old bubblegum. Because of this, Phineas and Ferb end up mistaking her for a mummy while trying to look for one.

Example of:
Coincidental Accidental Disguise