Two favourites, both involving Trigger. When the pub regulars are trying to guess what the baby will be called they send Trig up to the bar to find out. He comes back and tells them "If it's a girl they're going to call it Sigourney, after an actress. If it's a boy, they're going to call him Rodney, after Dave".
In the other scene, Rodney's in a fit of depression, so Trig tries to cheer him up by telling him about a guy who was so depressed he drove out to Beachy Head and was about to drive off the cliff when some people talked him round, had a whip round to pay off his debts, etc. Suitably cheered up, Rodney asks who these kind people were. Dell says "All the passengers on his bus". Priceless.