Stainless Steel

YY, look, there's a crack in the wall
>> Where?
There!
>> nrg
You want to look at it closer?
>> Yes
*carries him up for a closer look*
YY, you think the roof will crash down on us?
>> No, because got stainless steel inside, very strong, won't crash down
???!?

I asked my father: Did you tell him that there is stainless steel inside the wall?
>> No.
I asked the Big One: Did you tell him that there is stainless steel inside the wall?
>> No.

I don't remember reading any books telling him that there is steel inside the walls either. Where on earth does he pick up such information?

**Baffled.