The only other time I can think of unprofessional announcement was a United ORD-MSP. Weather was rolling in, the Pilot was making a futile attempt to get going before the next wave of weather rolled in. He swings the cockpit door open and says that we can get going as soon as the lady standing in the isle takes her seat. Apparently the FAs weren't working fast enough for him. He keeps going on and on telling her to sit down and she's going to make us all even later.

The problem was she couldn't because the there were two PAX with the same seat on their BPs. They had to get the GA down fix things up. I think the PAX ended up in F. But the pilot didn't think to ask the FAs what was going on before he made an fool out of himself.