Thick of It. Pretty much everything in it.
There are so many there but I have my favourite scenes that are sort of "mine" as in, I always remember these when the topic or even lose word association comes up.
Description of Tory party by Glenn having a rant:
"Six toed born to rule pony fuckers"
Olly bursts into hotel room at a party conference unaware that Malcolm and Glenn just had a bust up and says in an exaggerated Northern accent:
"Put the tiny kettle on lad! I'm gaspin'!"
Same episode: A member of public who was meant to accompany Nicola in her speech and policy launch at a party conference in Eastbourne gets bundled into a car by a very reluctant Terri while Nicola and Olly are watching from the hotel window.
Nicola: It’s Eastbourne Ultimatum
Olly: Yeah, the shittest spy film ever.
I say that every time Eastbourne is mentioned 
Malcolm interrogating Hugh Abbot about current trends:
Malcolm: Come on Hugh! Who is the only gay in the village?
Hugh: Eddie Grundy?
Malcolm describing Jeremy Paxman: The death mask of Shergar
Malcolm texting Nicola about her meeting Peter Mannion
“I know you’ve been meeting with that ageing flamenco guitarist”
And for something completely different: Curb your enthusiasm when Larry comes to visit Jeff and Suzy’s new house and refuses the “tour of the house”. Suzy loses it and says “What is wrong with you!? Nobody refuses a tour of the house you freak! Get out of my house you four-eyed fuck!”
When we bought the new house and people came to visit for the first time I’d laugh out loud when asking if they wanted tour of the house as a result.