Regular Show, Season 3

Muscle Man:
[reads] "Son, if you're reading this, you punched my face and freaked out in the field by the rest stop where I faked that picture. I'm sorry for pranking you all these years..."

[...]

Muscle Dad:
[writing on his forklift] "...especially about being a trucker. The world is a harsh place, and I only did it to toughen you up for when I'm gone. Now you know the truth — you aren't a Muscle Boy anymore."

Trucker:
Muscle Dad! We need those loads now!

Muscle Dad:
Yes, sir! Right away!

Trucker:
And take off that hat! You ain't worthy of it. [they leave, Muscle Dad takes off his hat and continues writing]

Muscle Dad:
"So please, drive to the highest point of the Trucker Hall of Fame, and spread my hat ashes over those stuck-up jerks. It's my final prank from beyond the grave. But if you hate me too much to do it, I understand."