A passenger was seen as running in the aisles while shouting incoherently. One steward later told me that the guy had already run out of the plane, then back in, and was shouting vaguely threatening or worried stuff all along.

All passengers were asked out of the plane, and made to go through the security check again (the X-Ray machines + individual patting). Then we all boarded the plane again, were taken to an isolated area of thr airport; all luggage was taken out, and we were all asked out with all out stuff to identify our luggage while they checked the plane inside with dogs and who knows what else.

It was done in good order and calm (and I think the Roissy airport security forces used the case as a full scale exercise, as a lot of personnel was brought in)

Nothing was found, and we took off 4 or 5 hours later than expected, without the guy.

But that was really bizarre and worrying stuff (and pretty much everybody saw the guy running agitated and shouting).

In the long run, we're all dead. John Maynard Keynes