The best part is the stunned look on everyone's faces during her annountment and then afterward their expressions as they recover from the tense moment. As well as Hugo pulling Alice off the floor.
Alice reading aloud from an old Bible that uses ſ, and (of course) pronouncing it as f. Cue Geraldine very firmly heading her off before she gets to the word "succour".
Alice: And he shall be thy...ffuu—
Geraldine's initial reaction to Harry's proposal of marriage.
In "The Easter Bunny", Letitia'sLast Request is for Geraldine to take up her mantle of the Easter Bunny, taking chocolate eggs around the village each Easter. However, it turns out that Letitia asked David to do the same. And every other member of the Parish Council too, in fact.
Owen: Oh, hell. Any more and we'll be able to stage a production of bloody Watership Down.
"Sorry I'm late. Sheep exploded."
In "Radio Dibley", David calls Geraldine's phone to insult Alice and everybody else, unaware that the call is being broadcast live on Dibley Radio. Geraldine then gives up trying to tell him that they're live, and proceeds to trick him into talking about his haemorrhoids - before revealing that they're on radio. At this point, David makes a pathetic attempt to pass himself off as celebrity impersonator Rory Bremner. It works (at least on Owen).
Hugo tells Geraldine he can't tell her what precisely his father said when told about Hugo's relationship with Alice. He chooses the word 'duck' to replace the offending word.
Hugo: He asked me what the duck I was playing at, said he didn't give a flying duck if I ducking loved Alice ducking Tinker, and if I ducking kissed her again, he'd make sure I was well and truly ducked.
David's performances as King Herod in the nativity play. Starting from his belief that Herod was unfairly demonised, he delivers the line "Kill all the children in Bethlehem. But kill them gently!", then starts handing out sweets to the children in the audience (which causes one child to say "I love you Herod"), and then when Alice (playing Mary) goes into labour, a few people wonder about the wisdom of Herod assisting with the birth.
Geraldine: I'll tell you what I want, Jim. I want to find one man on Earth who isn't the spawn of Satan.
David: Oh, good heavens, really.
Geraldine: And you can shut it too, egghead. You're all the same, aren't you? You're just a bunch of [DRILLING] who should be lined up and force-fed Winalot up your nose 'til you die. Which is actually what I'd like to do to your oh-so charming brother, who seems to keep his brains in his [DRILLING] which, frankly, is the size of a button mushroom.