Well, let that be a lesson to you.
3 seconds sound clip from the Christmas in July (1944) classic radio play.
You can hear this line at 00:15:19 in the radio play.
Quote context
[...]
- Hey, look who's coming, Mr. Baxter.
- Yes, everything's wonderful ma. I'll... well, I'll call you back.
- What's going on around here? What is this, a football game?
- What are you doing up on that desk? Never mind what you're doing, you're fired.
- James MacDonald sir, and this is my fiancée, Miss Casey.
- Well, let that be a lesson to you.
- Well, what's so funny? What is it?
- Waterberry, where are you? I demand an explanation!
- I really see no point in firing this lad...
- If anyone ought to be fired around here, it's me.
- Never mind the noble gestures, I'll decide what's what around here.
- Wait a minute, you don't understand what's happened.
[...]