I've only heard these announcements in one language, so there may have been language problems.
I dunno, if you're computer literate enough to upload a video to youtube I'm pretty sure you've also seen numerous movies where people on a plane don masks.
he was just too eager to be the first on Instahogram to upload it to put his mask on properly...
Totally agree with Wingnut. Most likely the 'get down' was aimed at someone too stupid to sit down