They're charging you for a second breakfast.
4 seconds sound clip from the The Fortune Cookie (1966) movie soundboard.
You can hear this line at 00:26:41 in the Blu-ray version of the movie.
Quote context
[...]
- Thank you very much. Sister, would you please put these in a vase?
- Goodbye now. Bye. You're very thoughtful. Goodbye.
- They kicked a field goal in the last five seconds... because I fumbled on the 12-yard-line.
- They're charging you for a second breakfast.
- Ever had a previous back injury? Hmm? Maybe when you were a child?
- The phone. Why doesn't one of you nurses answer the phone? What phone? It's ringing.
[...]