[Probably a good thing to do - having a curious person sitting next to you while you're doing something you'd rather not be questioned about is a recipe for awkward.

Luckily, Robert brushes it off quickly enough.]

It is... one of those precautions that one takes, hoping one will never need to find oneself using it - but being inordinately glad that one had thought to make it, in the event one has to.

[Which is a very roundabout way of agreeing.]