Play in the Dark

Fuss demands my presence in the bedroom to 'look at the dark' with his flashlight.

He's flashing it around showing me various things ("Look dada, Hat Monster! It's a pretty one!"), and eventually he alights on a mummy.
I don't see it, but he assures me it's there.

"Look dada, a MUMMY!"

"Where? Is it hiding?

"Dada, it's imagination!"

"OH, right!"

"Dada...mummy's ancient!"

?!?!?
Where the hell did that come from.