95% of the "amusing" announcements I hear fall into one of two categories:

1. Noone except the pilot (or whoever says them) finds them amusing. Aside from content, a lot of people who think they tell jokes well don't. If they're in charge, nobody is going to tell them.

2. They're the same ones frequent flyers have heard 473 times already, most of which have also been posted here several times. We know you turn the lights down to enhance the appearance of the FAs, etc., etc.

That said, the other 5% are fun. There's an AA purser nicknamed "Lucky" who does a great job. Wish there were more like him.