This is a parody of an Old Master Q (Lao Fu Zi) comic featuring Pinkie Pie and Indigo Zap
 
Original comic
 
 
Sci-Twi: “Is that Indigo Zap? She doesn’t look like her high-spirited self… looks more traumatized…”
 
Pinkie: “She must have had nightmares… I think she saw a very creepy ghost while she was dancing to music…”
 
Sci-Twi: “How do you know that?”
 
Pinkie: “I call it a hunch…”
 
notes:  
-The ‘ghost’ head in question is basically a mix of a Redead and Gibdo from the Zelda series (though they do the same things)  
-Originally wanted to use a Ghastly, but after showing a rough draft to meiyeezhu, it wasn’t scary enough…