[The scene opens on the smiling, sunny Island of Sodor, but something feels amiss. The rails are glistening a bit too much, and there's an unusual number of birds flying overhead in a rather suspicious manner.] Narrator: "Welcome to Sodor, a place where steam engines puff, diesel engines grumble, and havoc is about to ensue courtesy of our number one engine, Thomas." [Cut to Thomas at Tidmouth Sheds, wearing an unusually mischievous grin.] Thomas: *whispering to Percy* "I've got the most brilliant idea! It's going to be the grandest prank Sodor has ever seen!" Percy: *nervously* "I don't know, Thomas. Sir Topham Hatt says we should always be really useful engines, not really naughty ones." Thomas: "Oh, Percy, where's your sense of adventure? Anyway, I've watched enough human movies to know this is going to be epic. It's called 'How to Alienate Friends and Destroy Property'." Percy: *even more nervously* "That title alone sounds like it'll get us scrapped!" [Cut to James, preening himself at the washdown.] James: *smugly* "Ah, there's nothing like a good scrub to make one's paintwork pop. I'll be the belle of the tracks!" [Suddenly, a cascade of muddy water rains down on James, ruining his shine. Thomas and Percy zip past, laughing heartily.] James: *spluttering* "THOMAS! When I get my buffers on you--" [Thomas and Percy are far gone, executing phase two of their plan: switching the signs around to confuse the berths at Tidmouth Sheds.] Gordon: *arriving at what he thinks is his berth* "Why is my berth filled with... chicken feathers?!" [The chickens, released by Thomas and Percy, start chasing Gordon around, feathers flying everywhere.] Gordon: "Express coming through! Express chased by chickens, that is!" [Meanwhile, Diesel, always one to spot an opportunity for mischief himself, sees Thomas and Percy's shenanigans and decides to 'help'.] Diesel: *to Thomas* "Need an extra buffer? I've got just the thing. Follow me." [They sneak into Sir Topham Hatt's office, where Diesel tricks Thomas into broadcasting a message to all of Sodor.] Thomas: *into the microphone, giddily* "Attention, engines and all of Sodor! Today is Sir Topham Hatt's 'Appreciate a Diesel Day'. Show your love by painting yourselves and your berths black!" [The scene cuts to various engines and their drivers looking bewildered but dutifully starting to paint everything in sight black.] Emily: *doubtfully* "This doesn't feel right, but orders are orders!" [The island is quickly descending into chaos, with Sodor looking more like a scene from a slapstick comedy than the idyllic railway it usually is.] Narrator: "As Thomas and Percy watched their masterpiece unfold, they realized that maybe, just maybe, they'd taken things a tad too far." [Sir Topham Hatt arrives on the scene, wearing a paint-splattered suit and looking less than pleased.] Sir Topham Hatt: "Thomas! Percy! Would you care to explain why my splendid railway looks like a scene from a very questionable comedy show?" Thomas: *sheepishly* "We may have gotten carried away with a... project, sir." Sir Topham Hatt: "Indeed. And how do you propose to fix this... 'project' of yours?" [The next few scenes show Thomas, Percy, Diesel, and even a begrudging James, scrubbing, painting, and restoring order to the island, all under the watchful eye of Sir Topham Hatt.] Narrator: "And so, Thomas learned - the hard way - that while a bit of fun never hurts, there's a fine line between amusing your friends and alienating them. And, perhaps most importantly, he learned never to give Diesel creative control over a prank." [The engines are finally relaxing at Tidmouth Sheds, looking sparkling clean and right-side-up once more.] Thomas: "Well, gentlemen, shall we swear off pranks for good?" All: "Agreed!" [Just then, a sheep wanders into the sheds, covered head to hoof in black paint.] James: "Who's going to explain that to Sir Topham Hatt?" [All the engines turn to Thomas, who simply smiles sheepishly at the camera as the screen fades to black.] Narrator: "And that's another fine mess on the splendid, unpredictable Island of Sodor. Goodnight, everyone." [End.]