The bonus is that they say things I'd picture Cary Grant tellling Frank Sinatra at the bar. (Although both Frank and Cary would have been pissed if the barkeep slipped anything cutesy on their glasses, I'm sure.) My favorite is "Here's Mud in Yer Eye". Followed closely by "Happy Landings" and "Dear Old Pals".
(Why don't people talk like they did in old movies? Or, why don't writers write like they used to for old movies?? It's so much better than the things characters say today. )