Don’t you mean “Pony Paste?”

Mr. Cake: It looks a little dusty around Table 3. How about you sweep it out? [gives Pinkie a broom]
 
Pinkie: What’s the point? I can’t do anything right.
 
Mr. Cake: You’ll do fine. [Pinkie sweeps with the top instead of the bottom]
 
Fleetfoot: [approaches Pinkie] Hey pal. You just blow in from Stupidtown? [continues drinking]
 
Mr. Cake: Keep trying, Pinkie.
 
Delivery Pony: I’ve got a load of awards for Mr. Carrot Cake. [Pinkie becomes furious and sweeps harder]
 
Pinkie: WHY CAN’T I DO ANYTHING RIGHT?!?! [bangs the bottom of the broom on the floor making dust rise all over Sugercube Corner’s area, which makes the nearby ponies start coughing]

lol best crossover ever

@Background Pony #0E26  
No, it a boo to the last part, “fish paste” doesn’t make sense for ponies.

@Prof.NightJack  
What? Not a Spongebob fan? (Old Spongebob of course)

“Pony feathers” mighta fit better than “fish paste,” (even if that is what Patrick said) but I reckon this still works.