Jonathan Creek, Series 1

[Maddie discovers Cathy had slept with her father-in-law]

Cathy Strange:
What you knew? How?

Ingrid Strange:
I may be a wizened old bat in your eyes, Cathy. That doesn't mean I'm as blind as one. Some other time I'll give you a lesson in subliminal bonding gestures. For God's sake, I'd seen it coming for months. I'd almost say he needed it to flush it out of his system. Afterward when he told me and all the guilt came out, he threw himself on my mercy and...

Cathy Strange:
You're lying! Elliot would never tell...

Ingrid Strange:
Kathy! You have the body of a woman and the brain of a sexually stunted newt!