It's quite all right, Bonnie, I've been practicing for this all year.
3 seconds sound clip from Knight Rider - Halloween Knight (S3E5).
You can hear this line at 00:39:49.741 in the Blu-ray version of the episode.
Quote context
[...]
- Michael, you're right. There was another child by a first marriage, a son.
- Between stints in the family business, he's been in and out of mental institutions.
- What's his name, KITT? Oh, no.
- See if you can reach Devon. We've got to get to Bonnie before it's too late.
- Norman, I'm sure no one would mind if you took your mask off just to drink your champagne.
- It's quite all right, Bonnie, I've been practicing for this all year.
- Yes, if I could maybe just rest a minute.
- Come on, there's a couch in the hallway.
- Is something wrong, Norman? Norman... What is it? Norman! Norman!
- Devon, I've been trying to reach you.
- Nothing came over the remote communication system.
[...]