Don't panic

J: Man, we ain't got time for this #$%$... I don't know whether or not you've forgotten, but there's an Arquillian Battle Cruiser that's about to --

K: There's always an Arquillian Battle Cruiser, or a Corillian Death Ray, or an intergalactic plague that is about to wipe out all life on this miserable little planet, and the only way these people can get on with their lives is that they Do Not Know About It.

One of the key jobs of a project manager is to keep things calm -- to absorb stress rather than reflecting it (or, worse, generating it).

The project manager probably shouldn't be trying to cover things up as in this quote from Men in Black, but this scene correlates with a situation where an eager team member is about to get everybody riled up, before the project manager calms things down by reminding the exciter what the real objective and groundrules are.

There are plenty of times where listening to a team member's concerns privately (and seriously) will avoid an awkward meeting where the concerns are brought up out of the blue to unsettle the group as a whole.

And yes, there will always be crises to be addressed, in a project of any size. But it will always be better to address the crises calmly.