I'm certainly glad you're not mad.
4 seconds sound clip from the The Seven Year Itch (1952) movie soundboard.
You can hear this line at 00:24:37 in the Blu-ray version of the movie.
Quote context
[...]
- What happened? Oh, golly! The tomato plant fell over.
- Oh, don't worry. It's nothing.
- Forget it. It's just early Sears-Roebuck.
- If there's anything at all I could do...
- Do? Do what? Really. There's nothing to worry about.
- I'm certainly glad you're not mad.
- How would you like to come down here and have a drink with me maybe? Hmm?
- Let me just go put something on. I'll go into the kitchen and get dressed.
- Yes. When it's hot like this, you know what I do? I keep my undies in the icebox.
[...]