Flight attendant announcements are normally a super snooze alert. This guy spiced up the take off by adding a bit of rhythm to the normally super boring take off messages.
Why'd he do it? Maybe he spotted a few terrorists on the flight and thought that some tunes would act as a deterrent.
Normally I fly United just to gather frequent flyer miles, but I'll make the switch to Southwest Airlines just hoping that I get him on my next flight... or maybe a stripper attendant. Or better yet, a rapping stripper attendant. Now that would be cool.