Pinkie Pie's Silly Songs

Pinkie Pie's Silly Songs is the 11th episode of Season 9 of My Little PonyFriendship is Magic

The Water Buffalo Song
Wearing an oversized cowboy hat, Pinkie Pie comes out and sings that "everybody's got a water buffalo," until Twilight Sparkle brings the song to an abrupt end and critiques Pinkie's over the falseness of his lyrics. The segment ends when Pinkie Pie starts singing that "everybody's got a baby kangaroo," which makes Twilight so exasperated he charges at Larry and knocks him off the screen.

The Curling Iron Song
Pinkie Pie, wearing a towel and having recently emerged from the bathtub, rues the mysterious loss of her curling iron while hopping and dancing around in the bathroom. Derpy and Applebloom try to help her, but it is Rainbow Dash who finally solves the mystery.

The Dance of the Earth Pony
Pinkie Pie sings and dances to a "traditional Argentinian ballad, in its original Spanish", wearing a sombrero while being dressed like he's on a vacation, while Rainbow Dash, who appears to wear a white sheriff's hat, translates. However, Pinkie's lyrics begin rubbing Rainbow the wrong way when they begin taking a more personal turn, which angers Rainbow, who begins chasing him.

I Love My Lips
Pinkie Pie lies on a couch while he sings to his psychiatrist (played by Twilight Sparkle) about her fear of losing her lips. Her focus on lips is so absolute, a Rorschach test reveals that Pinkie Pie sees everything as a lip (and sings as much to the tune of the William Tell Overture).

Oh Santa
Pinkie Pie awaits the arrival of Santa Claus on Christmas Eve so that he can give Santa some Christmas cookies. He is first visited by a bank robber (Flam), a Viking (Derpy), and finally an IRS agent (Gizmo), whom Pinkie Pie shares his cookies with (except the IRS agent). When Santa (Bob) arrives, however, it is revealed that Pinkie's remaining two guests have stolen parts of his outfit and he is fed up with it, chasing the two off the set. The IRS agent pops back in and asks Pinkie Pie if he "claimed that" (presumably the cookie), and at Pinkie's 'No' head-shake, he grabs the last remaining cookie and leaves. Pinkie Pie says "Merry... Christmas" (presumably either to Santa or the IRS agent) and ends the song by staring at the viewer.