Wallace and Gromit/Awesome

A Grand Day Out

 * The whole plot of A Grand Day Out. Late at evening, the stores are closed; and we're out of cheese! The horror! What to do? Skip the evening snack and fight your cheese withdrawal until breakfast? Inconceivable! Hey, the moon is up...
 * A meta-example. Wensleydale cheese was in bankrputcy and nearly ended production, but when Wallace mentioned Wensleydale as a favorite cheese, sales skyrocketed and saved the company!

The Wrong Trousers

 * The model train chase from The Wrong Trousers. All of it. Especially when Gromit starts putting down track pieces in front of the train while at full speed and not only that, he is able to select the right pieces while doing that to pull off course corrections.
 * "I'll take THAT, if you don't mind."

A Close Shave

 * A Close Shave: Wallace and Gromit pursue Preston, driving a truck full of sheep, in their motorbike-and-sidecar. Gromit, in the sidecar, comes loose from the motorbike and rolls off the road and over a 2000-foot drop. One might think this the end of our beloved canine hero, but instead he hits a sequence of buttons in the sidecar, transforming it into a plane, armed with a porridge cannon, and proceeds to make repeated flyby attacks on Preston! Awesome.

Others

 * A meta-example to start things off: When A Matter of Loaf and Death aired, it was the most watched program of that day, beating that year's Doctor Who Christmas special. Let me repeat that. It beat Doctor Who.
 * The rescue scene from "Loaf And Death." Through a bizarre series of events, Wallace, Piella Bakewell, and Fluffles fall into a crocodile exibit in a zoo. Wallace manages to grab hold of the wall with his foot and catch Piella's ankle, but poor Fluffles ends up falling right into a crocodile's open mouth. Then, within literally seconds, Gromit hurtles over the wall, wraps the elastic string of Piella's sunhat around Piella's nose, uses that string to bungee jump into the crocodile's mouth (which he props open with a long loaf of bread to keep it from closing), and grabs Fluffles just in time for the elastic string to pull them both out. The crocodile's mouth closes too late, leaving it blinking in bewilderment as if to say "What the hell just happened?"
 * Another rescue scene, this time from "Curse of the Were-Rabbit". All in slow-motion. Over-the-top it may be, but very moving nonetheless.
 * A rescue scene that occurs a few seconds after the scene mentioned above,
 * And just afterwards: "Consider yourself dumped."