In some situations, too much of one, if hiding things counts as a facade.
In others, not enough.
I suppose a facade is porportional to how nervous I am about the situation. The thing is, the facade is obvious, so it just betrays how nervous I am. A better disguise of my nervousness would be not having a facade and not acting any differently in the situation. The thing about nervousness is that many people tend to assume there's a good reason for it, so it's a good thing to hide.