This morning

Keith (trying to screw on the lid of his B12):
I can't get it to close! Why isn't this closing?

Me, peering at it:
You're probably just overthinking it.

Keith (still trying, his movements becoming slightly more frantic):
It just won't go! This is really weird! Why can't I do this?

(I pick up the bottle, look at the lid, put the lid of B12 on the multi-vitamin bottle, and the lid of the multi-vitamin on the B12 bottle - whaddya know, both of them close properly).
See? I told you you were overthinking it.

Keith (sheepish):
Oh. Thanks.