My Little Pony: Friendship is Magic belongs to Hasbro. The tunes belong to the authors unless otherwise stated (this one belongs to Hasbro too, being from an earlier generation).

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"Derpy Hooves Is a Silly Pony"
To the tune of "Who's a Silly Pony" from Seven Songs and a Story

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Who's a silly pony?
You're a silly pony!
Who is? You is,
Derpy Hooves
Wrecking the town hall and
Draining apple basins
Who is? You is,
Derpy Hooves

Watch out with that thunder cloud
Lightning will go any way it will
And don't touch AJ's baked bads
Lest you end up very ill

Who's a silly pony?
You're a silly pony!
Who is? You is,
Derpy Hooves
Dropping half your cargo
Onto Twilight Sparkle
Who is? You is,
Derpy Hooves

Moving stuff with Boxxy Brown, and-
Whoops there goes a piano, crash!
Can you wrangle with the weather?
No, you just zapped Rainbow Dash!

Who's a silly pony?
You're a silly pony!
Who is? You is,
Derpy Hooves
Hiding in a coop and
Sneaking onto stage, oh
Who is? You is,
Derpy Hooves

/musical interlude/
Derpy Hooves
/musical interlude/
Derpy Hooves

When the Winter Wrap-Up comes
And bird-fetching you think best
Call for Flutter, she will fetch them
She will not go north or west

Who's a silly pony?
You're a silly pony!
Who is? You is,
Derpy Hooves
Emptying the basin
When we bob for apples
Who is? You is,
Derpy Hooves