Greet me when I enter the plane; thank me when I depart.

I tune out everything in between - professional or funny. This is okay for me since I know the emergency announcements after listening to them for so many years and flights - although after I read on here that the guy in the safety video working on his already turned on computer immediately after take-off was keying in garbage, I admit I payed attention a few times and concur that he was, indeed, typing in garbage.

Now that is funny.