Paper thin

I’m not complaining about the thinness of the walls in my office at work. At least I have an office (and a nice one at that). But sometimes, it borders on silly. Thus, the following from 2 minutes ago:

Me (typing away on my computer): , , .

Phone rings.

Me: This is Jamie.

Todd (whose office is right next to mine): Bless you. (Click).

With the walls as thin as they are, Todd could have just said “Bless you” in a normal speaking voice. Why did he have to call?