A prank too far

This is how a prank too far goes in 28 Train-Pranks Later.

[The ponies and engines go to talk to Percy]

Thomas: Percy! We need your help.

Percy: Okay. What for?

James: Are you honestly going to stand there and tell us you know nothing about all the pranking Gordon has been doing?

Rarity: Because he's gone too far this time.

[Percy gives a puzzled look]

Percy: Oh, no! He's been pranking up a storm!

Pinkie Pie: Well, I didn't find his last prank funny.

Henry: Me too. So, does our friends.

Fluttershy: Did he get you, too?

Percy: [laughs] Oh, yeah! He and Gummy both!

[flashback]

Gordon: Boo!

Percy: Aaah! [giggling]

[flashback ends]

Percy: They got me good.

Twilight Sparkle: Really?

Toby: Well, he needs to stop.

Percy: Stop? But pranks are so much fun!

Thomas: Not for everybody. And it doesn't seem like Gordon is taking the time to find out who enjoys them and who doesn't.

All but Thomas: [grumble]

James: Uh, since you and Gordon share such an, uh, affinity for pranking, we thought you might be able to get him to, um, uh... quit it!

[later]

Percy: Hey, Gordon! I have something very important to tell you!

Gordon: Percy, hey! I actually have something totally important to tell you!

Percy: Ok. What is it?